To unlock Sonic play classic with 10 characters or play 300 matches and to get Toon link play 400 matches or play classic as Link then you have to fight him!!!
Sonic Underground is an animated TV series. And no, you cannot unlock episodes, or characters other than Sonic, from Sonic Underground in Super Smash Bros Brawl.
no, however you can unlock him in super smash bros. brawl
If you're thinking of the Sonic Riders character, you cannot unlock him in Brawl.
Unlock Sonic
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.
u unlock sonic to get his stage
Sonic is not a playable character in Super Smash Bros. Melee; only in Brawl. Therefore, he cannot be unlocked in Melee.
"Clear Classic Mode with 10 Characters or 300 matches. Sonic is also known to appear randomly after clearing a few brawls, just try playing the subspace emissary and clear the stage.""http://hubpages.com/hub/how-to-unlock-brawl-characters--how-to-unlock-super-smash-bros-brawl-characters--unlock-brawl-characters--wii"
Super Sonic
Unlock sonic in the subspace emissary and you will get shadow the assist trophy.
Dark super Sonic is not a character in Super Smash Bros Brawl.
You don't unlock him! If you unlock Sonic and play as him, Super Sonic is his final smash.