you can't. He only appears as a trophy in the game or as a sticker.
Amy the Hedgehog is not playable in any Super Smash Bros. game.
Unlock Sonic
no, he is just an assist trophy
no.
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.
At this point in time, it is unknown if Nintendo will make a Super Smash Bros. Brawl 2.