Do you really hate? I know some people will say they're all cute, all useful in their own ways - blah blah... But I think everyone has atleast one pokemon they look at and think "Why does that exist?"
For me, it has to be Ledian.
I love ladybirds, they're precious. I even love ledyba! But ledian...... it's like a nasty, overly cartoony, evil little mickmouse hybrid. That's before I even looked at it's stats and move pool (Both terrible)...
Okay rant over. Share your hated pokémon, go go~
http://fc09.deviantart.net/fs51/f/2009/297/6/2/Ledian_by_Umbreon06.jpg Yaaaaack. x_x