Shan-Yu Easy Win
It doesn't matter what level you are. Put everyone on Technic Attack. Then, make sure you know how to use the Red Rocket Limit well and use it immediately when the battle starts. If the Heartless are still there, attack them. Then go attack Shan-Yu with aerial first and then try to get in a few combos. If you can use Red Rocket, USE IT!! If you parry his attack with Guard then you have some melee battle. Just keep pressing Triangle. You can also Blizzard Shan-Yu if you have enough MP.
More tricks, tips and cheats for this game are right here - Kingdom Hearts II cheats
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