I would say first have someone agile, like metaknight or pit. use that character to get through donkey kongs stage to the purple door. after the agile one, use a lot of powerhouses. make sure that up+b attack can do damage. if you lose a life before fighting tabuu, go back and get all the characters back. here is an example team: metaknight, ike, bowser, Donkey Kong, falco. using that team should increase your chance of beating Tabuu.
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To beat the Great maze and unlock the final battle with Tabuu, the ruler of Subspace, you but do both: Beat the possessed characters Beat every boss to find out how many people you need, after beating Dark DK, a bunch of undefeated people with appear. when you defeat them all, a gateway showing Tabuu's wings appear. go to the middle of the room to face the mighty Tabuu
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.
you have to beat Tabuu, get all the character's trophies, and get through it all.
You beat every character and boss in brawl, then go to the middle of the Great Maze which should look like subspace and all that; go to the middle and press up like you would for a normal door. You should find Tabuu there Warning- he is very hard to beat even on easy mode but you will find out how to beat him
tabuu is not a real character. you can not unlock him.