There are tricks to beating Riku... I haven't played in a while so I can't recall them.

Guard Armor's most difficult form was when he broke apart and his torso would spin. Then you really have to run away.

My least favorite part of the game was collecting Gummies. They them undiscardable, made them part of the actual treasure collection, and yet gave the same pieces you'd find in a chest in Gummy combat. I ended up with like three or four chests I couldn't open because I maxed out that type of Gummy in my collection through Gummy battles. F-ing USELESS.

At least they seemed to have fixed that in KH2