How to Beat Judge Ghis in Final Fantasy

Designate a member of your party the all-time healer for the duration of the battle because Judge Ghis can deliver huge amounts of damage with a variety of attacks.

Use physical attacks. Cast the spell Dark if you have enough MP. Defeat Ghis's underlings before attacking the Judge himself.

Continue using physical attacks on the Judge until he reaches 25 percent of his HP. The battle will stop and you will win.