Sets
Trick Room Sweeper
Beheeyem (M) @ Leftovers
Trait: Analytic / Synchronise
EVs: 252 HP / 4 Def / 252 SAtk
IVs: 31 / 31 / 30 / 30 / 30 / 2 [Fighting]
IVs: 31 / 30 / 31 / 30 / 31 / 2 [Fire]
Quiet Nature (+SAtk, -Spd)
- Trick Room
- Calm Mind
- Psyshock
- Hidden Power [Fighting / Fire]
This set is quite a nice one, it's lacking in coverage but given the right support it should do fine. The EVs max out its offencive power and bulk, as it's going to be taking a fair few hits as it sets up. The idea is to set up calm minds from the get go, and when you start getting a little low on health, hit trick room and try to sweep. Trick room and Calm mind are pretty much obligatory on the set, as is Psyshock. The last move depends on who you want to hit more, Dark types like Tyranitar that can ruin your sweep, or Steel types like Skarmory and Scizor. Make sure you have one of the types covered by your team. For example, if you opt for HP Fighting, running a magnezone wouldn't be a terrible idea to trap and remove scizor and Skarmory, Magnezone will also benefit from the trick room conditions.
Synchronise gets a special mention here as you can switch into Thunderwaves to ruin Thunderus and co and provide you with a means of set up.
Dear Reuniclus, I can do it too!
Beheeyem (M) @ Leftovers
Trait: Analytic
EVs: 252 HP / 252 Def / 4 SDef
Bold Nature (+Def, -Atk)
- Recover
- Calm Mind
- Psyshock
- Hidden Power [Fighting / Fire]
Ok, maybe it won't be as dominant as reuniclus, however it can run a similar set to some good effect. It has surprising bulk and can definitely be used to some effect in the lower tiers. The story's the same as in the first set. Run it with a magnezone to get rid of skarm / scizor or run it with Conkeldurr / hitmontop to get passed tyranitar.
The EVs max out its bulk, and give it a better chance of setting up. Leftovers is chosen to help with longevity and to cancel out weather effects... kinda like reuniclus... Wishful thinking.
I can... break Stall?!*I think this could be its niche set*
Beheeyem (M) @ Leftovers
Trait: Synchronize
EVs: 252 HP / 72 Def / 184 Spd
Timid Nature (+Spd, -Atk)
- Heal Block
- Thunderbolt
- Psyshock / Toxic / Nasty Plot
- Hidden Power [Fire / Ice]
Oddly... Beheeyem can break stall with this moveset. The speed makes it faster than most walls and the rest is thrown into bulk, howeber, a simple set of 252 SpA / 252 Spe could just as easily be employed here. The idea here is to break stall, not to be confused with breaking walls, it's to put defencive cores in a weird place. Synchronise is the ability of choice here, as you almost want to be poisoned or burnt, this aids hugely with the stall breaking process, as you follow this up with Heal Block. So now they are forced to attack you whilst having their own health drained from their own status, you then hit said wall with any move of your choice. Thunderbolt nails Jellicent and Skarmory, who will both be 2HKOd whilst they can't heal off the damage. Psyshock is your stab of choice and best bet at hitting Chansey / Blissey, whilst the final coverage move is down to choice. Hidden Power Fire Fries Ferrothorn and Forretress, whilst hidden power Ice takes out the ever present Gliscor.
You could forgo any of the moves for toxic, however, if you don't want to rely on synchronise / take status yourself.
Double Screens
Beheeyem (M) @ Light Clay
Trait: Synchronize
EVs: 252 HP / 252 Def / 4 SDef
Bold Nature (+Def, -Atk)
- Reflect
- Light Screen
- Psyshock
- Recover
The set that every psychic type and its brother shares. A pretty weak version or bronzong and espeon, but hell it can do it too.
Other Options
Choice Specs Can be used to give a surprise to the opponent. It does have very usable special attack. Just a shame that it lacks Trick.
substitute + Disable can be used in tandem as a disruptive set to cause switches and specifically help in countering / setting up certain pokémon.
Psychic can be used over Psyshock, however you will be eternally walled by blissey.
Shadow Ball can be used on a set somewhere, however the coverage it supplies is pretty redundant, as Gengar is hit harder by Psyshock and Jellicent is hit harder by Thunderbolt. Shadow ball could be used on the Stall breaker set over Psyshock to hit Dusknoir/clops harder.
Psych up and Swagger can be used in tandem to make some sort of novelty set, however considering Beheeyem's Physical movepool and Physical attack stat, this is ill advised.
Nasty Plot can be used over calm mind. However, Beheeyem will be taking a fair few hits as it sets up, so calm mind will generally be the better option. Would be best used on the trick room set.
Status Conditions It has a lot of them that it can use and as such can be made into some form of annoyer. Swagger + Thunderwave, for instance, can be pretty deadly.
Partners
One of the best partners is Magnezone, as Beheeyem can take out the fighters Magnezone fears, and can provide trick room for Magnezone. Magnezone in return can take out all the steel types that Beheeyem will lure in. Terrakion can make use of the Dark Typed attacks aimed at Beheeyem, with its Justified ability, netting it an instant +1 to its attack stat. Heatran also makes a great partner, as it can switch into Bug / Dark / Steel typed attack with impunity.
Counters
Anything with Trick or Taunt will generally hurt Beheeyem. Ferrorthorn is probably Beheeyem's biggest counter, being able to set up on Beheeyem and smash away at it with STAB Powerwhips. It's also slower than Beheeyem and can abuse Beheeyem's Trick Room.
Hydreigon is immune to Beheeyem's stab, can ruin it with taunt, and smack away with Draco Meteor's, Dark Pulses, Crunches or scout on it using U-turn.
Lati@s resists everything that Beheeyem can pack, aside from the occasionally hidden Power Ice, and can destroy Beheeyem with STAB Draco Meteor or simply Trick a choice item on it.
Thunderus, Tyranitar, Specially Defencive Scizor, Heatran, Chansey, Blissey, Lati@s, Bisharp, Spiritomb, Reuniclus, can all tank Beheeyem's hits and force it out with either strong Super Effective / STAB attacks or ruin it with taunt, or simply stall it out.
Beheeyem is a pretty cool pokémon with a nice Special Attack stat and reasonable bulk, however its coverage is limited and outside of gimmick sets it's doubtful you should encounter anything too surprising.
Little Cup Sets
Calm Mind
Elgyem (M) @ Eviolite
Trait: Analytic
EVs: 236 Def / 236 SAtk
Modest Nature (+SAtk, -Atk)
- Calm Mind
- Psyshock
- Hidden Power [Fighting]
- Recover
This set has very Reasonable bulk and packs quite a punch. It's a bulkier, status vulnerable, Solosis. Still Pretty cool, however. The set can be reconfigured to play like a poor man's Porygon, by running 236 Def / 236 SpD and a moveset of Toxic / Recover / Hidden Power Ice / Thunderbolt.
Elgyem is pretty much the same as Beheeyem in the lower tiers, a kind of obscure tank, wall-thing with an OK mix of attacks and stats. As with its final form, most of its sets will be outclassed by someone else.