The dark markings on Quagreon are prone to washing off in the rain. This does nothing to Quagreon's fighting abilities, but it will usually stop whatever it is doing at the moment to re-apply the markings. Because of this, it rarely wins fights.
Quagreon evolved from exposure to the moon's energy pulses. A Quagreon hunts by leaving its mouth wide open in water and waiting for its prey to blunder in.