I love Oshawott, Dewott is one of my favorite Pokémon ever design-wise... and then came Samurott. Adorable otter -> horrific sea lion with sea shells protruding left and right and some sort of tacky conch glued to its head. I just... can't.
Most Dark types. It's not a design thing, I just don't enjoy battling with them. If I want to destroy a Psychic, I'll stick to a Ghost or something with Shadow Ball.
Oh, and @Grass Type Warrior... I am right with you. Crazed Charizard fans are hard to take sometimes.
Safari: Dragon | Gabite, Noibat, Sliggoo
Pokémon X | FC: 4871-3955-6532 | Name: Brandon
Be humble for you are made of earth, be noble for you are made of stars.
Malamar and Skrelp.
Grimer and Muk - They look pretty awesome and the way they owned everything in the anime was awesome. But I just hate the thought of sludge brought to life and called a pokemon. It's just unhygienic and disgusting.
Mankey - I used it the whole way through Pokemon Red and Yellow, but I just hated it. It looked so damn ugly on the Game Boy.
Mewtwo - The thought of a man mixed with a pokemon is sickening.
I'd love to like Alakazam. I don't know why I hate it.
3DS Friend Code: 4699-6436-4610