Awesome, thanks! When resetting the rare Heartless, do you need to defeat the Heartless in each room when you're going two rooms away, or can you just skip all regular encounters?
Also, I don't know if this will help anyone, but I just tried the Dumbo trick that was mentioned above against the group of Gigant Shadows, and it totally works. 100% foolproof. As soon as they spawn, summon Dumbo and just Splash them all to death. Sora can't be hit while he's riding Dumbo, so they'll never run away and you'll always get the two Fury Stones from them. I did this with 13 MP and without Cheer equipped on either Donald or Goofy, so it's not like you need crazy stats to make this work. I actually still have a little time left with Dumbo once I've killed all the Gigant Shadows, so you could probably do this with less MP/summon time than I have right now.