In an earlier thread, some good fellow mentioned that Kingdom Hearts II is chock-full of exploitable gameplay loopholes, and other strategies that render its battles entirely easy.

I've finally got around to beating the game for the first time, and I'm keen to have another crack at it on the hardest difficulty. Before that, though, I'm interested in hearing about these little advantages and benefits that can be reaped by taking advantage of the gameplay.

Any tips?