Wailyu dwells near the water's edge. While it will go ashore to play with people and Pokémon, it must be careful not to be played with too roughly: it cannot easily regenerate limbs like Staryu.
It gathers with others in the night and makes its red core glow on and off with the twinkling stars. While this Pokémon usually lives in the sea, it can survive on land, although not too long.
