Beat Subspace Emissary then he appears
You can't.
They are not in the game
Shadow in not a playable character in Super Smash Bros Brawl; he is only an assist trophy.
Unlock sonic in the subspace emissary and you will get shadow the assist trophy.
Unlock Sonic
There is no Shadow in SSBB, but I do believe there are a sticker and trophy of him.
Shadow is not a character in Super Smash Bros Brawl, unfortunately.
shadow is not a playable character, but you can find him in an assist trophy.
You cannot become shadow in Super Smash Bros. Brawl.
No, in fact Shadow isn't even in Super Smash Bros. Brawl. He is from the Sonic games. Sonic however, isn't from Super Smash Bros. Brawl but Sonic is in Super Smash Bros. Brawl.
no, he is just an assist trophy
You can't. He's not an unlockable character is SSBB.