How do you get to fight Larxene at the end of Kingdom Hearts 2?

Luxord is pretty hard. The Whole battle is based on time. The less you get hit by the Luxord's cards the slower you time runs out, the more you get hit the faster it runs out. Try to avoid the cards as much as possible. If you hit Luxord his time will run out faster. If your time runs out you lose, and if you HP runs out you lose. You have to get Luxord's time to run out before you can beat him. When he turns you into a dice just run around until he turns you back, and try to avoid getting turned into a card.