Using Kirby's rock attack, (though dealing no damage to him whatsoever) does not work, you still go flying off the stage with 0%! As stated before high-flying characters would be good against a boss like Tabuu. Don't look into the cutscenes, don't use Sonic! A strong character would be good too so i suggest Meta Knight with multiple recovery moves, multiple jumps, and...being the only SS tier character in the Brawl roster

Using Kirby's rock attack, (though dealing no damage to him whatsoever) does not work, you still go flying off the stage with 0%! As stated before high-flying characters would be good against a boss like Tabuu. A strong character would be good too so I suggest Meta Knight with multiple recovery moves and multiple jumps. A character like Yoshi would be considerable due to his high jumping ability as well as Lucas and Ness but not recommended since all three have little recovery after that.