if your refering to kefka one of his forms can be stomped with a pheonix down. if you mean the last of the eight dragons then what you need is for your main fighter to have genji glove and offering equipped along with his best two weapons then give your best caster golden hairpin and the gembox(or which ever one gives double cast) then its simple just attack with the fighter then hit up the double cast of ultima rinse and repeat til dead let your other two members concentrate on heals and buffs fyi.