I HATE it when people say 'I'm down to 2 cads left, I used all my sleights I could and now I'm stuck' because they are ALWAYS using sleights. The only time I've ever asked a question or used a help guide was when I was stuck in Wonderland in KH1, I didn't know I had to step on the big stump.
ON TOPIC: Don't have any fire attacks, he just absorbs them, avoid having enemy cards or item cards. Especially enemy cards unless they REALLY help the battle. This clears the way for more attacks.
Also, if you have a chance, reload your cards to the closest you can before it actually restocks. Do this as soon as possible. That way, when you run out of cards, you just tap it and it already restocks!
Plus, dodge roll is ESSENTIAL for beating any bosses.