Any tips on beating Marluxia (KH 2 Final Mix)?

I'm referring to his absent silhouette, just to clarify. I've been stuck on this guy for a while, and I'm having a really hard time guarding against his attack. The more I play this game, the more I notice the delay on Sora's guard ability. It's not spammable, because of said delay, so your guards need to be basically frame perfect or you fail. Anyways, if you have any tips to beat Marluxia it would be most appreciated. Thanks.
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