First off, go to the Adventure Mode and press on a file you COMPLETED! Then press the dot that says "The Great Maze" but press the top-right part of it. When you start go through the down that is right in front of you. When you get out of the door go to the bottom-left and break the stones that are blocking the way and enter through the door. you will now be in the jungle, go through the path until you reach the door with the BLUE arrow pointing at it, go through that door. You will now be in Tabuu's liar, go in the middle and press up you will enter the long path to the the final and toughest boss, Tabuu. Do as much damage as you can to Tabuu, but don't KILL him, just do enough damage till he ALMOST has none. After you do that, wait very paitenly you the coin item, when it comes up, pick it up and fling it at Tabuu. BAM! You have a Tabuu trophy! If the trick did not work you probably did not do enough damage.