CometTheEmolga
Emolga's Trainer
Me? I think it has to be the unforgiving fanbase!
HMs. They take up move slots and you have to sacrifice a team slot for Watchog/Bibarel slave. The ones I hate the most, Flash, Rock Climb, and DEFOG.
One of the things I don't like is the fact that you can't bring items from gen 4 games over when you are transfering pokemon