u/speed-charge

If you KO all but one enemy, possibly put that one to sleep or petrify them if you want, and arrange your characters in a plus sign with an over leveled white mage in the middle and another white mage (or other healer) on the side, and keep hitting the over leveled white mage in the middle 4 times with fight and 2 times with cure/cura/curaga/other heal then you can powerlvl your party.

Useful for catching up some of your other party members that you haven't used much or have been sending on dispatch (which grants AP but not XP) to the average party level so that they're not overmatched when you do use them.