Hmm, it'd be cool, but not really and also would be kinda weird. Mewtwo is based off of mew. Mewtwo are engineered while mew are just the way they are naturally, so why would mew look like mewtwo. Well there's transform and how it can become even manmade pokémon like porygon. I guess if it had an interesting story behind it, yes.
True. I always use my Masterball on a legendary.
Next person wonders has never watched episodes of the anime from Kanto
False; I remember seeing a few.
The next person has skipped a generation of games.
Of the main games...I guess no. I've basically gotten them all around when they come out except Ruby and played all the ones I have, however I preordered HG and SS, but I've still yet to play through them.
Next person thinks psychic can't be super effective against scraggy, scrafty, and drapion while they are still dark type.