Also, dont turn on gaurd, because it takes teh place of dodge roll when your standing still. Dont use ars arcanum because it saps your mp. One thing you may consider doing is using the Strike Raid abuility because its a long distance attack, and magic doesnt work. When he says Welcome oblivion, fly around, like Rub said. Nextly, when he's in normal mode and starts doing the quick attack, dodge roll. Thats why gaurd is bad because you have to be moving to dodge roll. Counter is another good thiing to use in this battle. Also, i dont remember if i used the lady luck keyblade or not, but if your able to get it, use it because it has mp plus two but one less attack power. Use the white trinity mark in wonderland if you can at this point *i dont really remember, but i know i had it when i fought the dragon*