It'd have to be Eevee! They're my favourite! (although my yahoo address is j.igglypuff) hehe.
But yeah, Eevee is mad coooool! It can evolve into Water/Ice/Dark/Grass Etc.. My god.. Everytime i play Pokemon on my DS, i HAVE to catch a Ponyta or an Eevee!
I sound like a child, but oh well :)
Okay, that's all xD