my personal fav. is Mewtwo, because of 1 : the movie, and 2 : his extreme power... but if its unrelated to that, i'd say pichu, pikachu, or charizard, as pichu and pikachu are so cute, and charizard looks so cool
I have Pokemon ORAS. Gengar is pretty cool and I also like Beedrill. But I like a lot of pokemon equally and more specifically the not as over powered ones.