First, you need to get to faraway Island. when your there, mew will notice you and runs away and plays hide and seek with you. (keep track of its tail sticking out) once you click on mew, it will jump out and attack you!
(Note: Its at Lv. 30, so be prepared)...
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as i know, in Pokemon emerald, ruby and sphere
no.... only mew 2 but if you want one get emerald and use action replay on it and migrate it to your game
you can only get mew through a gameshark or Nintendo event. here is the gameshark to go to faraway island where you can catch Mew: 8DEB234A 4C8DC5EC
Mew does not evolve, Mewtwo is a completely different pokemon.
You would need the old sea chart which was given out at a Nintendo event which has long since passed.