If you really want to piss your opponent off, try out this deck idea which centers around switching your opponent's active Pokemon with one of his benched ones.
Golem-EX from XY-Generations' Megaton Fall attack is pretty boss, except for the fact that he does 60 damage to himself. This attack will most likely knock out the opponents Pokemon, but you can only use it three times before you knock yourself out. But if you use Dragonite-EX from...