Most Helpful Doubles Pokemon

It usually depends for me, but I'd have to say that I love using Dusclops as a partner, but in a very... unorthodox way. I pair it up with a Pokémon that knows a recovery move and a status buff move, and steal them off the foe with Snatch and Psyche Up. Then he keeps setting up trick rooms, and can't be knocked out because it keeps stealing the ally's health restores XD

 

[3D='charizard-mega-y']
STAB, sun-boosted Heat Wave is pretty insane. Not to mention it sets up for a lot of scary Fire-type Pokémon. as well as weakenin Water-type moves.

 

Hm, some of my favorite Pokémon in Doubles are Hitmontop and Klefki. Hitmontop provides nice Intimidate support (screw you physical attackers save for Bisharp and other Defiant users lol) and Klefki can be used for weather or speed control. Whimsicott also deserves a mention for priority Taunt, Encore (having fun with being locked into Trick Room or Fake Out?), and Tailwind.

Then if I feel really gimmicky I'll have fun doing stuff with Skill Swap.
^that being Skill Swapping Spinda's Contrary onto Arcanine who can then abuse it with Overheat and Close Combat, along with Morning Sun for recovery. So damn fun. XD

 

I feel Ambipom could be very strong in doubles. With STAB and Technitian, it can throw out a base 90 power Fake Out while your teammate sets up, and then disrupt the opponents with Thunder Wave and Knock Off, set up itself with Power Up Punch, create momentum with U-Turn or go for the straight KO with STAB Return, STAB Technitian boosted Double Hit, or one of the Elemental Punches.

 

Cresselia is one of the best setting Pokémon for a trick room set up.
She has tanky defense with the 120 HP, 120 DEF and 130 SP.DEF and can do some chip damage with
its 75 SP.ATK. It can do speed control, icy wind, thunder wave and trick room.
Even so, it can have moonlight to be more of a tank and even has helping hand which
makes my ally have 1.5 attack. With invested SP.ATK it probably can OHKO salamence, garchomp etc, and
do a lot of damage with psyshock or psychic. Overall, its good to use.

 

I like this opinion. Cresselia always has a nice place on the Doubles battles. Very popular and with its reasons. It is also one of my favorite Trick Room setters, and using it on Doubles is always a nice experience.

 

I've always been a fan of my custom TerraCott set. Still works great to this day. The idea is to start the battle with Terrakion and Whimsicott and have Cott use Beat Up on Terrakion to raise its Atk x4-6 (depending if it's VGC style or not). Either way, you have a monstrous attack built up and you basically use Rock Slide or Earthquake to wreck the opposing team. Make sure your Terrakion is running a Jolly nature though, for it needs the speed. Even then, I always run Tailwind on my Whimsicott just in case. In addition, I run Protect on both Mons for those accursed Fake Outers. Also, Sacred Sword on Terrakion for that extra coverage. You could run CC too, but I don't appreciate the Defense drops, especially if a Scizor is on the other side of the field waiting to Bullet Punch a hole in me. The other move I run on Cott is Taunt (to counter moves like Trick Room).
This set counters almost everything in a double battle. On top of it all, it's also a great team when going through the Battle Maison (or Battle Subway in B/W).

 

SPINDA!!!!!