Final Fantasy II Battle System Optimization hack by PPPOE:

 And what it does:

It has an effect similar to the CaptainMuscles hack: https://www.romhacking.net/hacks/1769/

-Added automatic battle mode (can automatically repeat the previous round strategy)
-When the monster dies or escapes, the attack target is automatically switched during the battle.
-Press any 3 seconds during battle to exit the auto mode
-Fix repeated experience bugs during battle

It also works on most Final Fantasy II translations and hacks.