it took me a while to deafeat him but when he uses the water clones just use the reaction command to get rid of them quickly and just attack him like carzy until he does it again

This one was tricky for me but I finally figured it out. Have Donald and Goofy hold all the POTIONS they can and have cure as one of your magic moves ,also have Sora holding some exilthers and potions. First lock on to him ,then when he sends out his water things and you can still attack him get out of lock and use the reaction commands. DO NOT USE THE REACTION STEAL THE THE SHOW!!!! thats how I got killed then when hes on his last bar of health finish him off with valor form (whitch you shoud have gotton from the three good faries.)