Fire type offensives are the best!
As for my favorites, here's the list:
Fire: fire starters final form
Grass: grass starters final form
Water: water starters final form
Electric: Pikachu, Manectric, Luxray
Normal: Tauros, Slaking, Blissey
Flying: Pidgeot, Staraptor, Togetic
Fighting: Hitmonchan, Lucario
Psychic: Alakazam, Gardevoir, Espeon
Bug: Scyyyhteeer!!
Ground: Dugtrio, Sandslash
Posion: Nidoking, Toxicroak, Crobat
Dark: Umbreon, Mightyena, Houndoom
Rock: Onix, Tyranitar
Ghost: Gengar, Spiritomb
Ice: Walrein, Dewgong
Steel: Scizor, Metagross, Aggron
Dragon: Salamance, Dragonite, Garchomp