mmmm im not really sure what ur problem is but dont use curaga baecause of the reload time and if u die in his wierd combo that almost kills u instantly make sure u have second chance before u start the fight to survive it and then immediatly use cure or cura he should be quit easy to dodge just never use thunder roll because its dodge rate is not good for dodging lol its mainly for attack and if he turns invisable (which he will) dodge like crazy until he shows up again and lock on and use thunder surge. well this is all i can do to help oh and one more thing it helps alot if ur above lvl 80. good luck with this and hope u get the mega mana keyblade NO NAME!!. oh almost forgot when he clones himself use thunder surge AS SOON AS POSSIBLE on the real copy (the one that walks) and all the clones should go and try not to use attacks often and very quick for he will freeze u in time and pretty much merk u so good luck.
after like 4 monthes of tryin to defeat this guy i finally did it and i want to know if u guys have done it or not and if anyone want tips just pm me and ill give u a hand