Yes.
Unlock him through the subspace emissary.
25 if you include the unlockables.
Mewtwo is not in brawl so that means you can't unlock him.
just go to super smash bros brawl unlockables then it will tell u everything
You can't play as him, but you can unlock him as an Assist Trophy, when you unlock Sonic as a playable Character.
There are no cheats, but there are many, many unlockables. Look at: http://www.gamefaqs.com/gamecube/516492-super-smash-bros-melee/cheats for a full list.
No Super Smash Bros. game will ever be released for the Xbox. Not as long as it's a Nintendo series. If that were to happen, it's likely that it would be considered by fans as the moment when the series "jumped the shark" (became worse).
Super Smash Bros., Super Smash Bros. Melee, Super Smash Bros. Brawl, Super Smash Bros. for Nintendo 3DS/ Super Smash Bros. for Wii U, Super Smash Bros. Ultimate.
Super Smash Bros., Super Smash Bros. Melee, Super Smash Bros. Brawl, Super Smash Bros. for Nintendo 3DS/Super Smash Bros. for Wii U, and Super Smash Bros. Ultimate.
I go on it quite a lot and for some reason it deleted my date when three Chartres were unlocked so un thanks to the blocks in my Gamecube I've started to go on it lately.
The "sequel" to Super Smash Bros. Brawl, in a way, is Super Smash Bros. for Nintendo 3DS/Super Smash Bros. for Wii U.
super meower bros! # super. # meower. # bros.