If you can choose a type...

[DerWindFIsh]

So I voted for Ice. I love ice type moves. However, I don't like that many ice type pokemon. I usually just stick an ice type attack on my water party member. My next favorite type is Fire, with Quilava probably being my all time favorite pokemon.

 

[Sheep]

I'll vote for this time and time again. Electric is amazing as an element and my favorite type by far with some awesome Pokemon. Not just Mareep but others like Raichu, Jolteon, Luxray, and Lanturn are all absolutely wonderful. If I could be a Pokemon I'd really want to be this type (even if it's just partially).

Other favorites are grass, ghost, and ice to an extent. =D