Yes you do unlock them (I guess you could call it that) by going through each stage in the Subspace Emissinary. There is also a mode called boss battles where you battle all of the bosses one-by-one. You get this mode after you beat the Subspace Emissinary.
You can Play as them in Boss Battle but only with a hack.
You can't play as the bosses.
Bosses cannot be playable characters in Super Smash Brothers Brawl. ~SiferTH
you dont
In Boss Battles, there are 10 bosses.
by beating the sudspace emaissry (all of it not flags or crowns beat ery level)
Bomberman isn't in Super Smash Bros Brawl.
play alot
You can't unlock Darkrai in Super Smash Bros. Brawl. If you hear a rumor it is obviously fake.
Rayman is not an unlockable in Super Smash Bros. Brawl.
You cannot unlock 8 bit Luigi in Super Smash Bros. Brawl. You can unlock Luigi though.
That game is not available in brawl. By blah head.
There is not playable character called Jet in Super Smash Bros Brawl.