Tools
Use the EU Version if you can, it as more up to date cheats like overclock to run the loading screens and textboxes faster (Eu Plugin 0004000000177000) (direct download)
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The Cheats list is in English (JP Plugin 0004000000176E00) (direct download)
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Na Plugin 0004000000176F00 (direct download)
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Allows you to modify your save file for homebrewed 3ds's (external link)
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Saves
All Costumes and Game completed. Should work in all regions. (please let me know if it doesn't work) (direct download)
Splits
Here if you are lazy (direct download)
Blank Splits Canvas that can be modified (direct download)
Patches