Well Kadabra are super-cool but they sound like toilets flushing :( I turn off my sound when I fight them :D
And parasects REALLY bug me, because they creep me out. Once I had a dream one of them was eating my toes and puking on my bookshelf, and then putting graffiti on my wall, it sounds stupid but it was really freaky! And they don't deserve to be in so many places, they're in mt. moon, the safari zone, and cerulean cave; they ruin some of my fave pokemon catching/training places. :(