Claret Dragon is an enemy fought exclusively in the Game Boy Advance and later remakes of the game, at the Sealed Temple. It is a dangerous foe as it has access to the Breath Wing and Tail Screw abilities, and upon death will cast the Flare spell. Having a Necromancer defeat a Claret Dragon will allow them to learn the Dark Arts spell Meltdown.
Ruby Dragon can first be fought during a dream sequence with Laguna's party, and later fought at various areas around Centra and Esthar, at the Deep Sea Research Center, the Island Closest to Hell, and at Ultimecia Castle in the Passageway. They are highly dangerous foes, having access to powerful abilities such as Demi, Flare, Meteor, and Breath, as well as having powerful physical attacks and access to Reflect.
Claret Dragon is an enemy fought at the Farplane as well at floors 61-64 of the Via Infinito. They are strong foes as they have high stats and resistance to magic, and can deal high Fire-elemental damage to the party with its Fire Breath skill.
Ruby Dragon appears on a Triple Triad card in the version available via Final Fantasy Portal App with different values than in its Final Fantasy VIII card.