Doga is a boss in Final Fantasy III. When the Warriors of Light are forced to fight him, he changes into his monster form.
As his gift of magic from Noah would imply, Doga is a master of magic.
Doga knows several high level Black Magic, such as Firaga and Flare. Dragoons should Jump while Dark Knights attack with dual-wielding Katanas. Curaga spells can be useful for restoring HP.