I have a lot ^^;; Heh heh...In no particular order;
Chimchar line. Ew. I can't help but think Chimchar is a monkey ripoff of Charmander. What is that ass flame even attached to? And the other two just because monkeys aren't my thing.
Volbeat & Illumise. They just...their designs don't scream "Pokemon" to me.
Kricketot & Kricketune. Kricketot's design, again, doesn't scream "Pokemon". And Kricketune..that cry. Everytime I come across a Kricketune, I die a little on the inside.
Nuzleaf. Pokemon shouldn't have nipples.
Spiritomb. Its design, to me, seems to be a cry for help.
Darkrai. What is it even supposed to look like? Besides, I dislike most legendaries.
Magnezone. Was an evolution of Magneton -really- necessary?
Electivire...again, did Electabuzz -need- to evolve?
Makuhita. It looks more like a potato sack with arms, feet, & a face than a Pokemon to me.
Meditite & Medicham. I just don't like them.
Magmortar. Why? Whyyyy?? Magmar was good enough!
Heatran. He just isn't visually appealing to me, plus he's a legendary.
Mismagnius. Misdreavus didn't need to evolve.
Baltoy & Claydol. They just don't appeal to me.
Torterra. If it had 2 big trees growing out of its back, or none at all, it'd be different. Its horribly unsymmetrical. I like symmetry.
Hippopotas. Something about it just doesn't look right.
Rhyperior. Rhydon was GOOD ENOUGH. Why did they have to go and make it evolve into something much less appealing?
Mamoswine. Again, the line didn't need another evolution.
Jynx. She looks too human-like for me.
Glalie. Its cry on the show makes -me- wanna cry.
Staraptor. It could do without the...hair?
Bibarel. That face creeps me out.
Purugly. Its a fat, ugly cat.
Lickilicky. Lickitung didn't need to evolve. Lickitung was cool by itself.
Alakazam. It needs a tail like Kadabra's.
Mr. Mime. Too human-like.
Smoochum. Too human-like.
Wynaut. What is that tumor growing out of its head?
Deoxys. Just..no.
Uxie & Mesprit & Azelf. Too similar...and just not visually appealing to me.
Nosepass & Probopass. Do I really have to say anything?
Prinplup & Empoleon. They just look..bleh. Piplup was cute, and they had to go and ruin it.
Arceus. It looks like a statue and that bothers me for reasons beyond my knowlage. 0o;;
The Regis. They just look stupid.