One of two things:
Also? Mewtwo. Well, no. Not so much "Mewtwo", in the proper sense, as that...thing that people keep drawing fanart of. Allow me to irrelevently rant for a moment, fellow Escapists, as there's a point. Why, in the name of every deity in every religion both real and fictional in all dimensions, do people want to make Mewtwo out as the illegitmate lovechild of Satan and Gollum who wants nothing but to corner you in a dimly lit area,look deeply into your eyes, whisper something apocalytically scary, then throw back his head and laugh as you die of fright-induced heart attack/choking on your own screams? He's got a sympathetic backstory in both the manga and anime, and by his second appearance in the latter, he's almost gotten frigging heroic, not to mention not looking very intimidating. So why, people,do I constantly browse through Pokémon fansites and come upon A JESUS CHRISTING HORRIFYING GRINNING SKELETON THING THAT WOULD MAKE SATAN SHIT BRICKS?!?!?!
In all seriousness, if anybody knows how this phenomenon came about, I'd really like an explanation.