get the 7 chaos emeralds
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You don't unlock him! If you unlock Sonic and play as him, Super Sonic is his final smash.
Get all the chaos emeralds and fight the final boss.
In the cutscene before the final battle with Tabuu, Sonic will appear and shatter Tabuu's wings. Sonic can then be chosen as one of the characters to fight Tabuu, and then you've unlocked Sonic the Hedgehog!
In Sonic Hereos, the only way to access Team Super Sonic is in the final level of the game. They are not playable in any other way.
(Hope you meant sonic battle as in SBA2) Play hero mode all the way till you get to the part(scene) were you and shadow turn super,then fight the final hazarded. :P