Well it's nothing personal for what that's worth. I disbelieve the claim here, not the person! Very few people on this board I'd believe that story from. Would need a nice tidy resume of Ninja Gaiden Blacks and Devil May Cry 3s and such at high difficulties under your belt for me to buy enough inate talent to pull that off. Especially on hard, which you seem to be implying you did it on. I mean I'm not saying it's a super hard boss fight but I'd imagine just getting the hang of the controls would cost you a life or two alone--
Though you seem to backtracking (at least, the feeling I got from your original post was you just picked it up completely green as can be and killed him in 3 tries) and/or clarifying a bit to say you had some previous experience with the game now so now I'm more inclined to believe you. I'm still skeptical if you say it was on hard given the total lack of forgiveness that difficulty has in KH1 but I won't outright call you a liar anymore, I suppose. Previous experience with how the game works + watching attack patterns for 2 hours is feasible, at least, if you have skill.
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No problem!
This is a cute and pop genocide of love!