I agree that Garbodor is ugly, he's a pile of trash, how couldn't he be ugly?
Jinx looks to me like someone wanted to create a Pokemon-Barbie and failed miserably.
What I absolutly don't like is Ariados. It's a giant, ugly spider :yuck:
And Tentacruel. There's cruel in it's name, it's fitting that it looks downright evil.
So many ugly Pokemon, if I thought more about it, there would come another ten to my mind...