Here's another Pokémon idea: Sableye (with Prankster)!
First, he comes out and uses Taunt. Everyone who is doing anything other than an attack fails to do what they were trying to do, I.E. those trying to recover simply fall, etc. Then Sableye uses Will-O-Wisp and inflicts everyone with Burn status, reducing their attack power in the process. Then the players try attacking Sableye, because he won't go away normally, but he holds on with Focus Sash, and then uses Recover. He then uses Foul Play on the nearest player, and powerhouse characters like Ganondorf and Bowser are hit the hardest by this, because it calculates its power based on the target's Attack stat, not Sableye's.
Sounds reasonable. Yep.
I love this build in Pokémon XY.
Sounds a lil OP...I like it.