Ponyta's line. I've found my Rapidash to be my best Pokémon overall. Mine is great in contests, great at battling, has a decent type, and is just overall cool.
I love a lot of Ice types, too. There's not that many and it's weak to fire and water, but it's got key strengths too. I think Articuno (tied for my favorite legendary), Cloyster, Lapras, Piloswine, and Weavile are just awesome. Just. Awesome.
Absol: It's just awesome.