I've just finished the Story Mode on Kingdom Hearts DS. (to the credicts) I'm wondering, after is there anything to do other than battle Xion again and duka from Moggle on story mode? Is that it?! (It just feels like the story hasn't finished yet...)

I'm pretty sure wewe can redo all your past missions(all)on holo-missions and make them better au just screw
around on them. Defeating the game also unlocks theater mode, where wewe can rewatch all the cutscenes. And if thats not enough, theres always mission mode(with dif. characters)