Worst is first. Competitive was all about Normals and Psychics. Dragonite had the stats to be the king but did not have the movepool since I believe the only dragon move was dragonbreath or something.
Best would probably be third gen. Nearly everything had its uses, even freaking Charizard was slightly more useful that gen than it ever was before (or after).
The one thing that holds me back about saying anything of Fourth or Fifth gen is Stealth Rock and the incredible focus on weather. --- PSN: julito427 (Hellsing) Currently playing: SSFIV AE, BB:CS2, Pokemon Black, MvC3 SSFIV: Oni, Cody, Yun