When battling kurt zisa,it's a good idea to be at least at level 75 and have the oblivion keyblade or the master keyblade. you should also have some potions and mega potions because some of the time you can't use magic which means no curaga. You should battle him with alladin and goofy because donald isn't that good. when you first start battling him, he will take away your magic and he will have two orbs in his hands, you will only be able to attack the orbs with your keyblade(you can also just make goofy and alladin attack him and you can just kick back and watch and run). Keep attacking him and eventually he will fall down and be open for attack. you'll also have your magic back(this is a good time to heal yourself). next he will have a shield up so you can only attack him with magic(you should only use fire). then he will fall again. you will attack again. but be careful because once you get his health down like 1 bar or 2, he will have a vertical blade attack and a horizantal blade attack where he comes right at you with. the horizantal blade attack, you can jump over it but you have to time it just right or you will get hit. the vertical attack, use a dodge roll or you will, once again, get bad damage. after that just repeat and sooner or later, he will die.