I understand why they did it, but I've never liked the fact that the fourth star piece is completely unguarded. So the purpose of this hack is to add a boss to Star Hill.
The star is guarded by Crippo, the well-known previously unused enemy. I've changed his stats and routine quite a lot. The battle starts with Crippo saying that he is the cream of the crop, and that he has bested all of his brothers. The dialog ends when Mallow makes a comment about his ego, and the battle begins.
About a third of the way through the battle, Crippo's more powerful sister, Giganta, drops in. At first Crippo is furious, but then he realizes that the two can work together to defeat Mario's group.
The hack is still incredibly buggy. If anyone can tell me how to make an enemy appear partway through the battle, I'd be very grateful. Right now, Giganta appears in the beginning, disappears after the first couple of turns, and then appears again later. Also, it seems I've overloaded Lazy Shell's dialog editor, and it gives me an error every time I try to open it. Finally, Valor Up is glitching, but Vigor Up! isn't, the game freezes when Lightning Orb is used, and Crippo keeps using a move that isn't in his scripts (Eerie Jig).
If you want even more details, read on, otherwise, you can stop here.