Gen V, the only one I like is Oshawott.
What? If anything they were better before the special/physical split (well Typhlosion was anyway). Anyway gen 5 starters were/are the worst. Emboar grew on me though.I voted Gen V because only Serperior is pretty much useful outside of playing through the game, even then with it's Dream World ability mostly. Now I would have put Gen II for the same reason, except they all improved alot in Gen IV for HG/SS.
Seriously how can you hate the cute starters?
I gotta say Gen V. None of them are that viable for late/post-game.
5th gen, you can really tell they phoned it in when it comes to design and typing.