For me, it’s gotta be the monkeys. (Simipour/Simisage/Simisear) They’re disgusting and terrible and I want to throw up wheneve I see them printed on a card.
Honorable mention to Gothitelle/Sableye/Chansey/Skarmory/Quagsire/Amoonguss. Those Pokemon also make me throw up when I see them, but for different reasons.
A friend of mine pointed out that Trubbish, Muk, and Weezing represent land, water, and air pollution. I knew they all represented some type of pollution, but I never really thought of them as a trio. Simple things like this allow me to appreciate Pokemon I once disliked.
There is no redeeming that stupid horse Keldeo, though.