Where on the map do you go to see Tabuu on Super Mario Smash Bros Brawl

you have to unlock the great maze. then search for bosses and characters around the maze and beat all of them. after that go to the middle of the maze and in the background there will be a giant door. it opens up and then you fight tabuu. if you go there before you've beaten all of the bosses and characters it will show you what bosses you havent beaten yet as trophies.