First of all, there are two ways to get Sonic in the Brawl: you can finish the SE(Subspace Emmisary); or you can play 10 characters in classic mode with or without continues on any difficulty level. (Personally, 10 characters on easy classic mode took about an hour and a half, when SE took more like thirty-two hours, so I would go with the second choice.
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To turn Hyper Sonic in Super Smash Bros Flash 2 You Have To go to Super smash bro flash 2 1.0 Verson Then pick Sonic Then Click Untill Sonic's Colors Green Next Get The Smash Ball Then Turn HYPER SONIC!!
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.
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.
Sonic can fight Kirby in Super Smash Bros Brawl.
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.