Wow I'm getting crushed by the first boss in KH2, just like when I first played this game a decade ago.
Edit: Man, it's just dawning onto me that it's been a decade ago. I remember playing the game over my last summer before starting college. The intro hit me hard.
Just spam triangle 99% of the time to win and then be brave enough to sink one or two hits in before going back to spamming triangle, like most of the fights in this game.