My first attempt at a four man double battle team....

[Silver Dragonair]

Slaking @ Choice Band
Trait: Traunt
Nature: Adamant
-Focus Punch
-Return
-Earthquake

Gardevior @ Lum Berry
Nature: Docile ( I cant find a modest Ralts, so I gave up at Docile)
Trait: Syncronize
-Thunderbolt
-Calm Mind
-Skill Swap
-Psychic

Heracross @ Shell Bell (item clause)
Nature: Adamant ( Jolly is only needed, with endure, salac, reversal)
Trait: Guts
-Rock Slide
-Megahorn
-Swords Dance
-Brick Break

I need a fourth pokemon...Im trying to get a team to fully support each other. I got Gardy and Slaking to help out each other. Because slaking has traunt. But I need a fourth pokemon I cant think o.

 

[Mequuh]

What's slaking's last move? 0_o..... Starmie might be a good choice for a last pokemon.

 

[Silver Dragonair]

What's slaking's last move? 0_o..... Starmie might be a good choice for a last pokemon.

I got shadow ball on there...

I need a Special Wall though. It seems im Lackng one, whats a good Umbreon double battle moveset??

 

[Aquarelle]

I need a Special Wall though. It seems im Lackng one, whats a good Umbreon double battle moveset??

Umbreon @Leftovers
Bold nature
EVs: 252 hp, 129 defense, 129 sp.defense
~Mean look
~Baton pass
~Wish
~Toxic/taunt
Well... it's an Umbreon moveset. It might work well in a double battle, trapping and then taunting/poisoning two pokemon at once, then baton passing a wish to a strong sweeper or something. I have never used it in a double battle before, so I don't know if it's effective or not.

If you want an alternative special sponge there's always...

Blissey @Leftovers
Bold nature
EVs: 252 defense, 129 hp, 129 special defense (Forgive me if my EV spreads suck)
~Seismic toss
~Softboiled
~Aromatherapy/ice beam
~Thunderwave

And then there's also...

Snorlax @Leftovers
Careful nature
EVs: Don't ask... lots in the defenses, attack, and the rest in hp.
~Curse
~Return/Body slam/Rockslide
~Shadow ball/earthquake
~Rest
^REALLY dominant poke, curselax.

 

[loopy100]

Hmm, maybe a flying type to stop Slaking killing your won with earthquake. Articuno would be good for a special wall, very high spcl def. And can learn a wide variety of moves.

Articuno (if possible)@ Leftovers
Calm nature (+spcl Def -Attack)
Blizzard
Fly
Reflect
Mist

Basically usse Reflect to enhance his spcl def more, and then wipe em out with Fly and Blizzard. Mist will guard against Toxic users.

 

[Swellow_91]

I need a Special Wall though. It seems im Lackng one, whats a good Umbreon double battle moveset??

Well , since it's for double battles you can consider using this :

Umbreon @Leftovers / Chesto Berry
Bold nature ( - Att , + Def )
EVs : with Leftovers -> 252 HP / rest into defenses
with Chesto Berry -> 252 SpDef / 252 Def / rest into HP
- Mean Look
- Toxic
- Helping Hand
- Wish / Rest
Just trap your opponent with Mean Look en use Toxic. Since your other pokemon are considered sweepers you can use Helping Hand to boost their moves. And if your low on HP , just use an healing move. If you prefer Leftovers go with Wish , otherwise go with Chesto Berry.

Some alternatives would be :
Regice @ Leftovers
Calm nature ( - Att , + SpDef )
EVs : 160 SpDef / 252 HP / rest into SpAtt
- Amnesia
- Ice Beam
- Thunder Wave
- Rest
Just use Amnesia to boost that already extremely high Special Defense. Thunder Wave to slow the foe and possibly gain a free turn. Rest to recover any lost HP and Ice Beam to get rid of any pokemon.

Blissey @ Leftovers
Calm nature ( - Att , + SpDef )
EVs : 252 SpDef / 252 Def / rest into HP
- Softboiled
- Seismic Toss
- Toxic / Thunder Wave
- Heal Bell / Light Screen / Protect
Standard Blissey set. Softboiled to regain HP , Seismic Toss to do some damage , Toxic to cripple your opponent / Thunder Wave to slow it down and Heal Bell to cure your team of status conditions / Light Screen to lower your opponents SpAtt for 5 turns. Possibly Protect so your Slaking can't KO Blissey with Earthquake.

I know I know , I'm horrible in giving movesets. Please forgive me.

 

[Crypted Wolf]

Slaking's Last move should be shadowball.

Umbreon EVs = Defence 252 / Sp.Def 46 / 212 HP

Blissey need more Bold and Less Calm.
Blissey EVs = Defence 252 / HP 212 / Sp.Def 46

Regice wants Bold as well.
Regice EVs = 252 HP / 148 Def / 56 SAtk / 52 SDef

Regice's Move set:

Regice@ Leftovers
Nature: Bold
EVs: 252 HP / 148 Def / 56 SAtk / 52 SDef
~ Ice Beam
~ Thunder Bolt
~ Rest
~ Sleep Talk / Thuner Wave / Toxic / Amnesia / Psych Up / Counter

Regirock can also work as last pokemon.

 

[SneazzL.com]

Hmm, maybe a flying type to stop Slaking killing your won with earthquake. Articuno would be good for a special wall, very high spcl def. And can learn a wide variety of moves.

Articuno (if possible)@ Leftovers
Calm nature (+spcl Def -Attack)
Blizzard
Fly
Reflect
Mist

Basically usse Reflect to enhance his spcl def more, and then wipe em out with Fly and Blizzard. Mist will guard against Toxic users.

That issnt good its more bad than good:

Articuno@ Leftovers
Modest
Ice Beam
Roar/Filler
Rest
Sleep Talk

I think this one sucks to but articuno do suck always so use Modest Starmie with the standard moves

 

[Crypted Wolf]

Starmie needs Timid not modest

 

[SneazzL.com]

Slaking @ Choice Band
Trait: Traunt
Nature: Adamant
-Focus Punch
-Return
-Earthquake
-Shadow Ball
Gardevior @ Lum Berry
Nature: Docile ( I cant find a modest Ralts, so I gave up at Docile)
Trait: Syncronize
-Thunderbolt
-Calm Mind
-Hypnosis/WoW/Toxic
-Psychic

Heracross @ Shell Bell (item clause)
Nature: Adamant ( Jolly is only needed, with endure, salac, reversal)
Trait: Guts
-Rock Slide
-Megahorn
-Swords Dance
-Brick Break

Earthquake is also an option for Heracross

I need a fourth pokemon...Im trying to get a team to fully support each other. I got Gardy and Slaking to help out each other. Because slaking has traunt. But I need a fourth pokemon I cant think o.

Changes and Sugestions in bold

 

[Tazzler]

Starmie needs Timid not modest

Doesn't matter. Go modest.

 

[Silver Dragonair]

Hey...Skill Swap was there so slaking didnt have to traunt.

This is a double battle team.

 

[Raito]

Garde isn't the mon you want to Truant either. Umbreon is best doing that.

Dusclops is a good All Around Wall

Dusclops @Lefties
Impish or Careful
EVs= Even out Defenses to about 310-340 I think is max. Make HP Divisible by 16.
WoW
Seismic Toss
Shadow Ball/Focus Punch
Filler/Substitute.

 

[Silver Dragonair]

You know you can switch traunt on to your opponent right?

 

[Lathspell]

Hmm, maybe a flying type to stop Slaking killing your won with earthquake. Articuno would be good for a special wall, very high spcl def. And can learn a wide variety of moves.

Articuno (if possible)@ Leftovers
Calm nature (+spcl Def -Attack)
Blizzard
Fly
Reflect
Mist

Basically usse Reflect to enhance his spcl def more, and then wipe em out with Fly and Blizzard. Mist will guard against Toxic users.

Wait a second, so I can stop laughing my a** off.
lmfao )

Oki, I'm done. Firstly, Reflect increases defense, not special defense, second, Ice Beam beats Blizzard because of accuracy and PP. Third, Mist protects against stat changes, not status, Safeguard is for that. Fourth, Two turn attack moves are of NO USE. Fly sucks big time on anything that's not called Trapbat in GSC.

Now, to the point at hand.
Slaking is made for hit and run attacks, not really for double battles. Skill Swapping Truant looks great in theory, but it actually sucks. In those two turns that you are using to send truant to your opponent, Gardevoir gets Two hit KOed by an opponent's earthquake. In those two turns, it can use two CM's and become quite impenetrable to special attacks, or Will-o-Wisp some attackers to reduce their atk. You might want to use Curselax + some ground resist/immune. Since Curselax is a Physical attacker, you might either try Gengar, as a special attacker and a Lax counter, or Elemence as a special sweeper, both immune to lax's Earthquake. You can add Claydol to the team, and use it for a wall/ppaser. (Light Screen, Reflect).
Another option may be: a statuser (pokemon with poison powder for example, or Thunder Wave, or WoW) and either Heracross or Swellow. Swellow + Status + Guts + Facade + STAB = well, OHKO I guess. You can use a CB Heracross with Sleep Talk and use something to put him to sleep, then watch him rape.