This bug allows you to artificially level-up your non-main characters (including your reserve character's SupportLV).
Requirement: You must have recruited between 23 and 26 characters in all.
Then you have to:
1) Kick out all party members (the first character you kick out will not level up).
2) Save your game.
3) Reset your game (L+R+Select+Start).
4) Re-recruit your characters.
5) Repeat.
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