Uhhh... it doesn't
FAIL
Youneed the three Unknowns that spell Mew, Palkia, Dialga and Pikachu.
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Mew does not evolve you have to get mew two separately
you can't evolve pikachu in the game but if you trade a pikachu from red or blue you can evolve it with a thunder stone but if you try to evolve the pikachu you get at the begging of yellow it just upsets pikachu
you need dialga pikachu holding a mind plate palkia unown m e and w and the nationldex then when you have them go to full moon island and use a rare candy on pikachu
You can't make Mew evolve, because Mewtwo is a clone or something from Mew. Or you must Hack the game. But I don't know a easier way.
come on - thunderstone!
you CANT evolve mew !!!!
pikachu can evolve into raichu.eevee can evolve into jolteon.
you can not get a surfing pikachu if you heard rumors it is probaly someone with a mew that can use surf and the mew has transformed into pikachu.
Pikachu doesn't evolve by level, you have to evolve him with a thunderstone.
Mew does not evolve...... Mewtwo is a sucky copy of Mew not its evolution