OU Threat Index

[Ice Blue Dragon]

This is a thread where people can post counters to a certain pokemon, so that people can easily check here to see how to stop that pokemon.


If you are posting here, try to include a damage calculation to prove tha the pokemon you suggested can counter the pokemon in question.
If there are multiple sets (such as mixmence and DDmence) say what set it counters.

Example, The standard Gliscor only has Earthquake, and Ice Fang for coverage. Rotom-W can usually swap in and OHKO with Hydro Pump. With 252 special attack EVs and a neutral nature, Hydro Pump is a guaranteed OHKO on max HP/minimum special defense Gliscor(120-144%). Though Gliscor's Facade will do 42-49% to 0/0 Rotom-W from a minimum attack set, they rarely ever carry that. A flight Gem +2 Acrobatics will OHKO, you will usually just see the poison heal set, and Rotom-W can still swap in on Earthquake. If it's timid, it will always outrun the acrobatics set anyway. Zachmac


Credit to Smogon for the OU tier list
Credit will be given at the end of the pokemon counters in italic and underlined and bold.


Alakazam

Blissey: Breloom, Conkeludurr, Espeon(with Psyshock), Gliscor(with Sword Dance), Infernape(expect nasty plot), Jirachi(even special calm mind, it can use it as set up bait), Lucario, Metagross, calcs,Metagross's Meteor Mash is a 2HKO or 3HKO on Blissy, always a 2HKO if adamant(42-50% of it's health is lost).
Blissy's Flamethrower is only a 3HKO with 37-44% of it's health on Agiligross(52 HP EVs). If it has 252 HP EVs, it's just 32-38% of it's health is lost. It'll still have to watch out for that, but if Blissy is running Seismic Toss, it's safe to call Metagross a complete Blissy counter. (banded), Mienshao, Calm Mind Reuniclus (Magic Guard to stop toxic), Scizor, Scrafty(with Lum Berry or Shed Skin to prevent toxic), Terrakion, Toxicroak, Tyranitar(with super power), and Virizion(Physical.) Zachmac toxic can force blissey out if it does not run aromatherapy, but most blissey have natural cure, which will cure the status. Ice Blue DragonSubsplit Gengar as a counter to Blissey and the newcomer Eviolite Chansey, with Substitue it block the possible T-wave and then hits a good amount of damage with Focus Blast, thanks to life orb and the Substitute you will wear you already low HP to steal a huge amount from blissey, also Softboiled and wish only have 16 PP while Pain split has over 30 easily stalling both Blissey and Chansey out of recovery even assuming they carry both at the same time. pkmnswampmaster


Breloom: Celebi(resist both moves, ability cures sleep), Cloyster(can only come in while it uses Substitute, though, needs to watch out for both STABs), Dragonite(especially with lum berry), Espeon(only if you predict spore), Gengar(especially with Substitute), Gliscor(with Ice Fang/Acrobatics), Gyarados(Sleep Talk, I don't know about others), Haxorus(especially with Lum Berry and Dual Chop), Latios and Latias, Salamence, Skarmory(watch out for focus punch,It can deal a lot of damage), Venasaur(In sun), Volcarona Zachmac

Bronzong

Celebi

Chansey: Subsplit Gengar is a counter to Blissey and the newcomer Eviolite Chansey, with Substitue it block the possible T-wave and then hits a good amount of damage with Focus Blast, thanks to life orb and the Substitute you will wear you already low HP to steal a huge amount from blissey, also Softboiled and wish only have 16 PP while Pain split has over 30 easily stalling both Blissey and Chansey out of recovery even assuming they carry both at the same time. Pkmnswampmaster


Cloyster

Conkeldurr

Dragonite: Stealth Rock is it's biggest weakness as it ruins Multiscale. Starmie can outspeed and KO it (with rocks), even after one Dragon Dance. Cloyster is a great counter to Dragonite, because of its giant defence and it's ability. Cloyster can outspeed, break through Multiscale with Icicle Spear, and KO in one move ( watch out for extreme Speed). Status also really hurts Dragonite and will ruin it if its is not carrying a Lum Berry. If it outspeeds (scarf), Haxorus can take it out even with Multiscale intact because of Mold Breaker. After Stealth Rock, many users of Ice Shard can take it out including Mamoswine, Weavile, and Donphan. Dr. Chaos

Dugtrio: Dugtrio fears priority pokemon users. Any sweeper with priority like tech scizor wit bullet punch, Pure power Azumarill with Aqua jet, Mamoswine with Ice shard (same with Donphan), tech breloom mach punch (hates Aerial ace though) , Conkeldurr with mach punch (But taking the EQ or Aerial damage can piss him off though), Abomasnow too. jireh the provider
Espeon

Ferrothorn: Most Fire type moves will OHKO so pokemon like Salamence, Heatran, Lati-twins (With HP fire) Hydreigon, Dragonite, Infernape, etc. will be enough to beat it, laso strong Fighting moves like Close Combat from a Terrakion wil take it out, other fighting type worhty of mentioning is Conkeldur which can set up Bulk Up and finish it with a Drain Punch to restore any damage, Magnezo is by far the best counter as the typical Steel Killer, but also it can trap Ferrothorn and use a Substitute + charge Beam to set up freely then KO it with HP fire to finish the job and also get ready to sweep Pkmnswampmaster

Forretress

Gastrodon: Go Grass. Most Grass type attacks will 1HKO it without any trouble, just be careful of support, and also make sure Grass moves don't hinder you. Tank Vaporeon with Hidden Power [Grass] is good, because it can be bait then 2HKO, and wall Gastrodon. Ferrothorn is the best counter to the standard set, and if you're careful it can also take Specs. Toxic is a pain for Gastrodon, just make sure it doesn't Toxic you in the process, this makes the job good for Natural Curers. Any Guts pokemon will just laugh in Gastrodon's face then retaliate with a boosted attack. A Jellicent with Taunt can wall it, as long as you have made sure not to boost it's Sp. Atk so it can hit hard with Earth Power. Anything with Taunt works if you can wear it down, because then it can't recover. Special walls that can take toxic (blissey and chansey namely, ferrothorn is an attacking pokemon against it mainly) are annoying, and will eventually kill it. Barbeller

Gengar

Gliscor

Gyarados

Haxorus

Heatran

Hydreigon

Infernape

Jellicent

Jolteon

Jirachi

Landours

Latias: Tyranitar (crunch) is pretty much the go-to Pokémon when you want to get rid of Latias. Chansey/Blissey take hits all day and have T-Wave/Toxic to cripple Lati for the rest of the match. so can Ferrothorn thanks to being a Steel type and often carries T-Wave. Mamoswine's Neutral Natured LO Ice Shard does 51.1-61.1% to 252 HP/0 Spdef Neutral Latias. In return Latias' Dragon Pulse does 44.2% - 52.5% to 0/0 Mamoswine, so Mamoswine won't be switching in if entry hazards are on the field. 76 HP EVs are enough to prevent the 2KO (as long as SR isn't on the field) but Mamo will be left with about 8% health. Mamo can ko with icical crash if latias is paralizied But then again, Mamo's presence on the field could be enough to scare Latias off. AuraWarrior8 But in most cases, the best way to kill it is to status it. (anything but burn) BarBeller Weavile can also work with Swords Dance and Ice Punch.Uberssuck20

Latios

Lucario

Magnezone

Metagross

Mienshao

Ninetales

Politoed: Although most Politoed that I've seen run Focus Blast, Ferrothorn 0HKOs with Power Whip almost all the time even with 0 Atk EVs and Neutral nature. Standard Smogon Ferro takes usually 70% damage from Focus Blast. However, I'm assuming this is the first round of battle. SoMaPoKiTo Politoed is worthless without its Rain, even with Specs or Scarf, 90 Special Attack and 70 speed won't cut it offensively in other weathers, while defensive sets suffer from a mediocre Defense stat. If you change the weather, Politoed is nigh worthless, meaning that many things can check it once it's Rain has been removed. Most things with STAB super effective attacks counter Specs and Scarf, so Galvantula, Ferrothorn, Breloom, and so on can beat it if they come in on the switch, as they will take massive damage from the appropriate attack. Defensive sets are slightly harder to counter, as they can cripple boosting sweepers with Encore or Perish Song, and walls with Toxic. Your best bet is to hit it with powerful STAB attacks that hit its average Defense, Choice Band Dragonite and the aforementioned Breloom are good choices. In the Sun, most Chlorophyllers counter it with ease, outspeeding even the fastest Scarf sets and hammering down with powerful STAB attacks like Solarbeam and Horn Leech. MagikarpRules


Reuniclus: Reuniclus may seem incredibly threatening to a standard team, excellent bulk, immunity to passive damage, sky-high Special Attack, and Recover, but it has two or three hard counters. Scizor and Tyranitar both can inflict massive damage with their STAB Attacks, and can play deadly mind-games with their Pursuits. However, TrickOrb Reuniclus variants can cripple them, and neither can switch into a boosted Focus Blast. SubDisable Gengar beats any Reuniclusw without Shadow Ball, Disabling their Psychic move, forcing them to switch out losing all of their accumulated boosts. Spiritomb, although rare, is a complete stop to Reuniclus, packing Choice Banded Pursuit to blast it away as it switches out. With TrickOrb, Reuniclus's set of counters greatly changes. If it runs Calm Mind, it is susceptible to Dark-types such as Shed Skin Scrafty, as it can set up on it with impunity and shrug off the status thanks to Shed Skin, while if it runs Focus Blast it lacks the boosting capabilities of the Calm Mind set and as such much of its power, meaning it can be beaten easily by Psychic types such as Victini or other fairly bulky things that can tank Psychic/Focus Blast, like specially defensive Jirachi. Magikarprules


Rotom-W

Salamence

Scizor: Scizor, although it has powerful sweeping abilites, is easily countered. It is stopped in the tracks by many common F/W/G cores as they often carry Jellicent and/or Heatran. Heatran is sit hard by superpower or brick break though, which makes a switch in risky, but most varities odf Heatran can outspeed and OHKO Scizor with [insert fire attack here] even, in some cases, in rain. Jellicent however, counters Scizor completely, resisting both its STABs and being immune to the ever common Superpower. Although some scizors carry pursuit, Jellicent has little to worry about this as it will not be switching out but instead staying in to burn Scizor, possibly crippling it for the remainder of the match. There's also Gliscor who resists all of Scizor's common attacks. Although Gliscor can't directly theaten Scizor, its high defence and Poison Heal usually allow it to get in a SD and KO with Earthquake. And who can forget steel-trapper Magnezone, who can switch into either of Scizor STABs and OHKO with HP Fire, the Scizor unable to escape. Against Scizor's who don't carry a fighting type move, Magnezone can sub, boost its SAtk with Charge Beam and usually take down another pokemon. However, one can argue that CB Scizor with U-turn isn't countered by these as it simply U-turns out on the switch and inflicts some damage in the process. Bearing this in mind, I'd say that PhsyicallySkarmory is arguably the most effective counter to Scizor as it resists its STABs, shakes of Superpower and can phaze it out if it tries to boost. Furthermore, it can lay down spikes, meaning that Scizor's repeated switching from U-turn will instead be its undoing. Triple Z Water types such as rotom-w 4x bullet punch, and takes large parts of its heath with hydro pump. kaiser soze Gyarados resists fighting, bug, and steel, so Scizor's only means of hitting it is the rare quick attack. Zachmac



Scrafty

Skarmory

Starmie

Swampert

Tentacruel

Terrakion: Gliscor and Slowbro are your best bets for countering this miniature behemoth, though repeated Stone Edges (or X-Scissors for Slowbro) will wear them down. Both can survive a +2 Stone Edge, however, even from Life Orb variants ( 77.4% - 90.96% on Gliscor and 72.59% - 85.28% for Slowbro, so both need to look out if Stealth Rock is on the field), and retaliate with their powerful STAB attacks (Scald deals 58.33% - 69.44%. while Earthquake deals 69.44% - 82.41%, so if Terrakion's taken a little prior damage, they will KO). Down in UU, we have things that could counter Terrakion better than pretty much anything in OU. The Nidos and Golurk both resist the combination of Fighting/Rock/Bug, and retaliate with their powerful STAB Earthquake. Claydol is in a similar boat, but gets hit hard by X-Scissor. Durant may not take a hit well at all, but it outspeeds all non-Scarfed Terrakion, resists Quick Attack, and retaliates with a OHKO Iron Head. Latios can come in on a Close Combat and slam it, while Specs variants can Trick it, to lock it into a boosting move. Beware of Tricking it a Choice Scarf, it is now primed to ravage your team. Swampert can't take a boosted Close Combat well at all, but it can come in on Choice-locked Stone Edge and use its STAB attacks to cripple it. Defensive Rotom-W can survive a Close Combat and retaliate with either of Hydro Pump or a crippling Will-o-Wisp. Though rare, Prankster Sableye can Burn it, weakening it, while Taunting it to prevent it from Swords Dancing back to normal, and Recover stall until Burn takes its toll. Magikarprules

Toxicroak

Tyranitar

Vaporeon

Venusaur: You will rarely see him used out of sun, due to chorrphyill. Becuase it's speed it doubled, you wil need a scarfer to take it down. Ice Blue Dragon Most venusaurs actually run: Energy ball, sleep powder,growth and HP fire or HP ice (mostly HP fire). Heatran might be a decent counter though he still can be put on sleep and then be killed by another member of the team...
Mamoswine's ice shard can be useful dealing some nice damage, weavile is similar in this, chansey can switch to any move and it doesn't care much about sleep powder, paralyze ruins venusaur, dragonite is a great counter against those sets which lack HP ice and ferrothorn is great against those without HP fire. IIan


Virizion

Volcarona



Note, If any pokemon not here are viable in the meta-game, please say so.

 

[AromaFlora]

I'm fine with a project-like idea as long as it's accurate. Keep in mind that Mamoswine is, actually, NOT an effective Dragonite counter as it cannot safely switch into, perhaps, more than half of the common Dragonite's movepool. For instance, the Offensive DDnite carries DD/Outrage/Fire Punch/Earthquake. Mamo can indeed switch in on the DD and Ice Shard... oh wait, Multiscale. Err, I guess you'll have to expand on the little part with "residual damage from Stealth Rock and/or sandstorm." Even without a +1 bonus from DD, Dragonite can deal 73.2 - 86.46% with Outrage and 61.32 - 72.37% with Fire Punch, which certainly threatens a 2HKO on Mamoswine. In return, Mamoswine is able to 2HKO with Ice Shard (Multiscale on the first hit), but since Mamoswine will ideally be switching in to "counter", well, it's at the losing end.

Analyze your data carefully and please do not misinform your audience. I'm keeping this thread here because this area of the competitive forum receives more traffic - people don't even know the "Guides" subforum exist lol.

 

[Zachmac]

Blissey
This is assuming with toxic. If it has thunder wave, it's a dangerous swap in for some of the pokemon.

Breloom, Conkeludurr, Espeon(with Psyshock), Gliscor(with Sword Dance), Infernape(expect nasty plot), Jirachi(even special calm mind, it can use it as set up bait), Lucario, Metagross(Not certain how many hits it takes to KO, so until someone does the calcs, banded), Mienshao, Calm Mind Reuniclus, Scizor, Scrafty(with Lum Berry or Shed Skin to prevent toxic), Terrakion, Toxicroak, Tyranitar(with super power), and Virizion(Physical.)

Breloom
Few pokemon can swap into spore, so at least one pokemon ends up asleep. Unless you have a status absorbeder or espeon, you'll probably have to let a non-counter fall asleep.

Celebi(resist both moves, ability cures sleep), Cloyster(can only come in while it uses Substitute, though, needs to watch out for both STABs), Dragonite(especially with lum berry), Espeon(only if you predict spore), Gengar(especially with Substitute), Gliscor(with Ice Fang/Acrobatics), Gyarados(Sleep Talk, I don't know about others), Haxorus(especially with Lum Berry and Dual Chop), Latios and Latias, Salamence, Skarmory, Venasaur, Volcarona.

I'll do the next few when I have time. By the way, I'm only listing OU pokemon.

 

[Ice Blue Dragon]

Ok thanks Aroma. I will do my best to keep it accurate. Zachmac, I will add most of it to the list.

Edit: Aroma, I removed the example.

 

[Zachmac]

^I was adding Breloom counters as you made that post. You might want to add those to.

I'm unsure about Toxicroak, though. I'll have to check that out with some calcs.

 

[Ice Blue Dragon]

Wow, your on a roll. I added it to the list.

 

[Zachmac]

Metagross's Meteor Mash is a 2HKO or 3HKO on Blissy, always a 2HKO if adamant(42-50% of it's health is lost).

Blissy's Flamethrower is only a 3HKO with 37-44% of it's health on Agiligross(52 HP EVs). If it has 252 HP EVs, it's just 32-38% of it's health is lost. It'll still have to watch out for that, but if Blissy is running Seismic Toss, it's safe to call Metagross a complete Blissy counter.

Now, if you want to have a good example on your first post, I think you should bring up Gliscor and choice scarf/specs Rotom-W. The standard Gliscor only has Earthquake, and Ice Fang for coverage. Rotom-W can usually swap in and OHKO with Hydro Pump. With 252 special attack EVs and a neutral nature, Hydro Pump is a guaranteed OHKO on max HP/minimum special defense Gliscor(120-144%). Though Gliscor's Facade will do 42-49% to 0/0 Rotom-W from a minimum attack set, they rarely ever carry that. A flight Gem +2 Acrobatics will OHKO, you will usually just see the poison heal set, and Rotom-W can still swap in on Earthquake. If it's timid, it will always outrun the acrobatics set anyway.

 

[Ice Blue Dragon]

Ok, thank you. I will add those to the list and the rotom as an example.

 

[Vandslaux]

SpDef Jirachi is a counter to Cloyster. It resists Ice and Rock, and can take special attacks from mixed Cloyster. It can also take a Razor Shell if need be. Jirachi can paralyze it back, crippling it.

 

[Dragonicwari]

I can look into more if need be, but I'm pretty sure gastrodon is an excellent counter to gyarados when it runs hp electric, being immune to it's main stab, and resisting the edge quake combo. I'm not sure if gyarados runs a substitute set but if it does it would carry and water and normal type move for coverage easily being countered by jellicent.

 

[Zachmac]

I can look into more if need be, but I'm pretty sure gastrodon is an excellent counter to gyarados when it runs hp electric, being immune to it's main stab, and resisting the edge quake combo. I'm not sure if gyarados runs a substitute set but if it does it would carry and water and normal type move for coverage easily being countered by jellicent.

Wrong. First, it does not resist Edge Quake. Next, the standard Gastrodon is max special defense, not defense. In fact, neither of smogon's sets are max defense. At +1, Substitute+Dragon Dance's Gyarados's bounce would be doing 70-83% damage, and the offensive dragon dance would 2HKO with EQ, even if it's nature is neutral(though a 3HKO if the Gastrodon gets lucky, it looks like it'll usually be a 2HKO) at +1.

It only counters if it's a bulky set running stone edge. Actually, I don't think it even counters the Substitute set since that would make Gyarados immune to burn/poison, and would allow Gyarados to set up more Dragon Dances on it.

 

[Vandslaux]

Why hasn't this been stickied yet? Or will it be stickied once it's more complete?

 

[Ice Blue Dragon]

^Maybe when it becomes more complete, and it is proven to be reliable.

 

[Aurath8]

Latias
Tyranitar and Scizor are pretty much the go-to Pokémon when you want to get rid of Latias. They can both sponge its attacks, OHKO with their STAB and trap and kill with Pursuit. Scizor has to watch out for Hidden Power[Fire], but as far as I know, only me and dragonuser have discovered how good HP[Fire] Latias is. I used HP[fire] Latias before it was cool.
Chansey/Blissey take hits all day and have T-Wave/Toxic to cripple Lati for the rest of the match. so can Ferrothorn thanks to being a Steel type and often carries T-Wave.
Mamoswine's Neutral Natured LO Ice Shard does 51.1-61.1% to 252 HP/0 Spdef Neutral Latias. In return Latias' Dragon Pulse does 44.2% - 52.5% to 0/0 Mamoswine, so Mamoswine won't be switching in if entry hazards are on the field. 76 HP EVs are enough to prevent the 2KO (as long as SR isn't on the field) but Mamo will be left with about 8% health. But then again, Mamo's presence on the field could be enough to scare Latias off.

 

[Dr.Chaos]

Great idea, my friend Ice Blue Dragon. This will really be helpful to many battlers.

Dragonite
Stealth Rock is it's biggest weakness as it ruins Multiscale (Many of the examples I will give will involve Stealth Rock since it is very bulky with Multiscale). Starmie can outspeed and KO it, even after one Dragon Dance. Scrafty can also kill it after a couple boosts. Cloyster is a great counter to Dragonite, because of its giant defence and it's ability. Cloyster can outspeed, break through Multiscale with Icicle Spear, and KO in one move. Status also really hurts Dragonite and will ruin it if its is not carrying a Lum Berry. If it outspeeds, Haxorus can take it out even with Multiscale intact because of Mold Breaker. After Stealth Rock, many users of Ice Shard can take it out including Mamoswine, Weavile, and Donphan.

 

[Ice Blue Dragon]

Thank you AuraWarrior and Dr. Chaos, I added most of that to the list, along with a few details.

 

[Barbeller]

I'm fine with a project-like idea as long as it's accurate. Keep in mind that Mamoswine is, actually, NOT an effective Dragonite counter as it cannot safely switch into, perhaps, more than half of the common Dragonite's movepool. For instance, the Offensive DDnite carries DD/Outrage/Fire Punch/Earthquake. Mamo can indeed switch in on the DD and Ice Shard... oh wait, Multiscale. Err, I guess you'll have to expand on the little part with "residual damage from Stealth Rock and/or sandstorm." Even without a +1 bonus from DD, Dragonite can deal 73.2 - 86.46% with Outrage and 61.32 - 72.37% with Fire Punch, which certainly threatens a 2HKO on Mamoswine. In return, Mamoswine is able to 2HKO with Ice Shard (Multiscale on the first hit), but since Mamoswine will ideally be switching in to "counter", well, it's at the losing end.

Analyze your data carefully and please do not misinform your audience. I'm keeping this thread here because this area of the competitive forum receives more traffic - people don't even know the "Guides" subforum exist lol.

I believe Icicle Crash OHKOs with multiscale up.

Latias: Tyranitar and Scizor are pretty much the go-to Pokémon when you want to get rid of Latias. They can both sponge its attacks, OHKO with their STAB and trap and kill with Pursuit. Scizor has to watch out for Hidden Power[Fire] Chansey/Blissey take hits all day and have T-Wave/Toxic to cripple Lati for the rest of the match. so can Ferrothorn thanks to being a Steel type and often carries T-Wave. Mamoswine's Neutral Natured LO Ice Shard does 51.1-61.1% to 252 HP/0 Spdef Neutral Latias. In return Latias' Dragon Pulse does 44.2% - 52.5% to 0/0 Mamoswine, so Mamoswine won't be switching in if entry hazards are on the field. 76 HP EVs are enough to prevent the 2KO (as long as SR isn't on the field) but Mamo will be left with about 8% health. But then again, Mamo's presence on the field could be enough to scare Latias off. AuraWarrior8

Tyranitar is a decent counter, if it packs Crunch it kills, however without it's just set up fodder. As long as it doesn't switch, latias can sponge Pursuit for about 30% damage, then proceed to set up with Recover and Calm Mind. Scizor is somewhat unreliable, as a Hidden Power [Fire] OHKOs without any boosts iirc and Latias outspeeds. Basically, neither of them can reliably kill it. You mentioned Scizor, but you need to say about Tyranitar. Ferrothorn will be killed by Hidden Power [Fire]. I don't know about Mamoswine, it might be useful, and it can KO a para'd Latias without any damage (assuming it packs Icicle Crash). Honestly you're best bet against Latias is to Status it while its setting up - though if you can wear it down a bit but so as to not make it use recover, you might manage a KO from a 'counter'. You need to be careful to not give it the wrong Status, I know I often try and burn my Latias.

 

[Triple Z]

Scizor

Scizor, although it has powerful sweeping abilites, is easily countered. It is stopped in the tracks by many common F/W/G cores as they often carry Jellicent and/or Heatran. Heatran is sit hard by superpower or brick break though, which makes a switch in risky, but most varities odf Heatran can outspeed and OHKO Scizor with [insert fire attack here] even, in some cases, in rain. Jellicent however, counters Scizor completely, resisting both its STABs and being immune to the ever common Superpower. Although some scizors carry pursuit, Jellicent has little to worry about this as it will not be switching out but instead staying in to burn Scizor, possibly crippling it for the remainder of the match. There's also Gliscor who resists all of Scizor's common attacks. Although Gliscor can't directly theaten Scizor, its high defence and Poison Heal usually allow it to get in a SD and KO with Earthquake. And who can forget steel-trapper Magnezone, who can switch into either of Scizor STABs and OHKO with HP Fire, the Scizor unable to escape. Against Scizor's who don't carry a fighting type move, Magnezone can sub, boost its SAtk with Charge Beam and usually take down another pokemon. However, one can argue that CB Scizor with U-turn isn't countered by these as it simply U-turns out on the switch and inflicts some damage in the process. Bearing this in mind, I'd say that PhsyicallySkarmory is arguably the most effective counter to Scizor as it resists its STABs, shakes of Superpower and can phaze it out if it tries to boost. Furthermore, it can lay down spikes, meaning that Scizor's repeated switching from U-turn will instead be its undoing.

 

[Dragonicwari]

Just an addition to breloom: magmortar with vital spirit (once it's released if it's not released yet). It would be immune to spore and have STAB supereffective fire type attacks against it.

 

[The Imposter]

Reuniclus: Reuniclus may seem incredibly threatening to a standard team, excellent bulk, immunity to passive damage, sky-high Special Attack, and Recover, but it has two or three hard counters. Scizor and Tyranitar both can inflict massive damage with their STAB Attacks, and can play deadly mind-games with their Pursuits. However, TrickOrb Reuniclus variants can cripple them, and neither can switch into a boosted Focus Blast. SubDisable Gengar beats any Reuniclusw without Shadow Ball, Disabling their Psychic move, forcing them to switch out losing all of their accumulated boosts. Spiritomb, although rare, is a complete stop to Reuniclus, packing Choice Banded Pursuit to blast it away as it switches out. With TrickOrb, Reuniclus's set of counters greatly changes. If it runs Calm Mind, it is susceptible to Dark-types such as Shed Skin Scrafty, as it can set up on it with impunity and shrug off the status thanks to Shed Skin, while if it runs Focus Blast it lacks the boosting capabilities of the Calm Mind set and as such much of its power, meaning it can be beaten easily by Psychic types such as Victini or other fairly bulky things that can tank Psychic/Focus Blast, like specially defensive Jirachi.