Not available on Brawl, and never will be. Sorry.
NO!
You can't.
Mewtwo was not included in Super Smash Bros Brawl, so you can't unlock or play as him in the game.
Unfortunetly, no. You can get him as a trophy, though.
Mewtwo is not in brawl so that means you can't unlock him.
Rayman is not an unlockable in Super Smash Bros. Brawl.
Mewtew is not on super smash brothers brawl; only on Super Smash Brothers Melee. Lucario is sort of Mewtew's replacement on Brawl, though there are quite a few differences between them.
That game is not available in brawl. By blah head.
There is not playable character called Jet in Super Smash Bros Brawl.
No. But that would be epic.
No mewtwo is not in the game super smash bros. brawl
Mewtwo is only in Super Smash Bros. Melee. He is not in Brawl