Mmm..
I really dislike Hitmonchan, Simisage, Lucario, and the entire Geodude line.
Hitmonchan is just creepy looking to me, it's too humanoid, and creeps into the uncanny valley territory. Plus it irritated me whenever I tried to breed a Hitmonlee or Hitmontop (both of which I like).
Simisage, it's by far my least favorite of the monkeys...I like the other two because they have that awkward, cute, derpy factor but still in the anime/art can look cool, but the grass one just looks like a smug jerk to me with hairy eyebrows. Manly? No. Ugly, yes.
Lucario, not just because it's incredibly overrated, but because it creeps me out. The design is okay, not great, but they gave it so much that it is pretty much a Gary-Stu Pokemon now. The Lucario movie gave me a sick feeling in the pit of my stomach.
Geodude, because they're ugly and Rock is my least favorite type. Nuff said.