Be around Lv 58, Make a deck with Raganarok, with 9 0 0 but alot of that in there like that formation, then you get mega Flare in tehre but alot of those to in there, make sure u get Elixer or something so u can get them all back in ur deck. cuz Ragnarok will hit him and Mega Flare will hit him too and they both leave ALOT of damage off of him usually like a halfa bar, or a bar, or more. also after that fight, you face his final form, and u cannot change decks, so after that, you face a even worse Marluxia, soo. good thing u got 0's in there so u can break his Sleights, and the be close to him when u use his 0 cuz it leaves alot of damage too, so dont do any sleight in there but u can in the beginning, and the hit him with the 9's too, and the fire. thats how I did and I beat him my second try(on the last fight, not the one ur stuck on, I beat him my first.) thats how I beat him in the Japanese, and English Version.