Gengar is menacing as fuck, hoooly shit.
I love the old Warturtle design, he looks like such a punk.
Charmander's a classic and Rhydon is the coolest useless pokemon
Mewtwo by far is the coolest pokemon. Hands down.
Dragonair, Charizard and Blastoise are all easy picks. I don't remember that Charizard sprite but damn if it doesn't look cool