You must defeat all the fihters and bosses then return to tabuu s door near the center of
the pause screen map then defeat him

There's like these doors with purple stuff around them i call them purple doors!!! Go in
and you see a fighter, it will be like a blackish purple colour, find them defeat them
all. Sometimes if your having trouble finding them pause to view the maze map, if you
havent discovered a door to a place there will be a dot with no line if you have there
will be a door with a line attached to another place. Where the devil faces are is where
the bad guy is.
At the dots you have to go through them to discover a new place, there could be about 3
purple doors in that place, follow where they are on the pause go to them defeat them.
Defeat them all and at one point you should have gone through a door that leads to a place
with every ones statues/trophy's, go through there again there should be a giant magic
looking door and a see through wall. Keep pushing up on the wall. Defeat the final boss.
Tabuu!!!