mewtwo has been and always will be my favorite in any game, a pokemon created to be the most powerful that can speak to you and control people. The movie made this thing seem god like for a reason, it was truly the first super power. But if you want to go with standard pokemon,
Truly effective in battle and the fact that it was cool, with was one of the best 3rd evolution pokemon you could get besides the starters. Sure there was
but you had to do a trade for that and I hated that idea.
All in all, 1st =