Rin said this:
On gbatemp users are just confusing savedata hexedit with realtime cheats. They think they're the same and they operate on the same part of the game. That's wrong and they're just confusing people trying to use rinCheat.
Savedata editing = Operations are on savedata files
Realtime cheats = Operations are on RAM (Stack + Heap)
Oh, I had no idea how Rincheats works, my bad. Well, if you want to get enough money to buy all costumes in one go, you can edit the money in hex, get the eboot file from that Chinese website and replace yours. The eboot file changes the 1.5m "limit" to 99,999,999.