Tabuu is a Pokemon a rare Pokemon.
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He dos not really have a weakness but if your of the screen you can dodge his wing atack thing and hit him like a ton.
If you mean playing as Tabuu you cant so you cant unlock strictly speaking.
Apparently you can. My friends friend has apparently played as Tabuu and Matser hand. WICKED!!!
You can't.You can only beat him as a boss twice.After that you can fight him again after you beat Tabuu in Boss Battles.
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!