you can get it from EB games, Gamespot (if you live in America) Game, there are lots of stores that sell the games
If you mean mewtwo then you can't only two ways the new (not yet in u.s.) Mewtwo event or use poke transfer
yes there is in about 4 months into the future
pokkemon grey virsion
It does not have an engilish version, but it will have an English version soon.