I think you must defeat every shadow character and boss in The Great Maze.
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you have to beat Tabuu, get all the character's trophies, and get through it all.
You get to the Middle of the maze and go against the dude with the wings.
yes because when your defeat their boss the boss's trophey dissapears.you can use your map to find the bosses
in the great maze, when you press + or start. there are many different bowser heads in different locations, they are the different bosses you've fought and all of the brawl characters on the subspace emissary. when done with that, you go to the place that looks like the jungle to the purple arrow and enter the big door to fight tabuu and once you defeat him, you win.
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