My personal favorite will always be Persian; I love cats, and I always like the looks and attacks of Persian in the games. They've been put on the wayside in the new games I find, but I still love them.
I also like Feraligatr, Blaziken, Wobbuffet (not really for battling purposes, but the Anime and online jokes of it), Lopunny, Zangoose, Jolteon, Ninetails, Sandslash, and thanks to XD, Breloom.