Eorayn pretty much mentioned every single Pokémon of Generation V that I have a problem with. In terms of cool/interesting-looking Pokémon, Gen V is the worst in my opinion. Timburr and its evolutions for example are complete disasters. But to be fair, we've gotten some awesome ones too. Such as Krookodile (that is one mean motherf*****, I don't care what you say).
Also, Spoink is AMAZING. That is all.