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Wailmuku spend most of their time resting on the ocean floor by using their spiny appendages to latch onto rocks for stability. Wailmuku have become a notorious pest to fishermen, often attaching to boats and stealing catches.

It can eject its internal organs, which it uses to engulf its prey or battle enemies. While this Pokémon usually lives in the sea, it can survive on land, although not too long.