The Red Dragon is a boss from Final Fantasy IX. The party fights several of them in Mount Gulug. They guard several pieces of equipment, appearing after the party has taken the piece of equipment and set back on the path. The party fights a Red Dragon on three occasions, during two of which the party fights two Dragons at once.
Unlike in other games where the Red Dragon specializes in Fire-based attacks, this one uses Wind-based attacks, though it still resists Fire. Quina can learn the Blue Magic spell Twister from one if s/he can use the Eat command on one.
It is highly recommended to do this as soon as possible as there are only three encounters and cannot be found randomly. Especially since the next opportunities to learn is Abadon on Terra past the point of no return for disc 3 and the crystal version of Tiamat at the end of Memoria.