I've sworn off of Gardevoir simply because of that bullslag and that is truly sad. She's a beautiful Pokemon but after so much Rule 34 art....
Adding to the list:
Cute Pokemon-Don't get me wrong; there are some cute Pokemon out there, but the traditional "I'm meant to be cute so you have to love me" types like Pikachu and Emolga, annoy me. So do the squealing fans. Besides, the idea of cute is pretty darned subjective.
Misty-I was watching an older ep of Pokemon and realized that I simply canNOT stand her. The whole "Bring back Misty" thing turned me on her and I also realized that as a character, she's not all that blasted great. In fact, she struck me as an annoyance, even more than Iris! So yeah, definitely not a Misty fan over here.