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“Due to their appearance and their lifestyle, Pyukumuku are considered unappealing to tourists. Part-time work chucking Pyukumuku back into the sea is available at tourist beaches. But no matter how far they’re thrown, Pyukumuku will always return to the same spot. Once a Pyukumuku finds a place it likes, it won’t budge from it. If someone moves it away, back it comes to the same spot. If it runs out of food to eat in that spot, it’ll stay there—and starve. The people of Alola found this so pitiful that they developed a tradition of chucking Pyukumuku back into the food-rich sea whenever they come across any thin-bellied Pyukumuku. Pyukumuku are covered with a slippery, viscous fluid that has a moisturizing effect. Pyukumuku can stay on land for a week without drying out. The people of Alola use this fluid for skincare products. Pyukumuku hate to have their spikes and mouths touched, and if you step on one, it will hurl out its fist-like inner organs to strike at you. Pyukumuku has a new Ability, Innards Out, which no other Pokémon has had before. With the Innards Out Ability, when this Pokémon faints, it will be able to deal one last bit of damage to its opponent, equal to the amount of HP it had left before it received the final blow.”
Pyukumuku is an aquatic Pokémon with an ovoid, black body. Two lines of three pink spikes run down each side of the top, and it has a white puff for a tail. Its face consists of two pink eyes, with a mouth roughly in the shape of a five-pointed star. It can spit its organs from its mouth and use them like a limb; this "limb" has five "digits" which can take on either the shape of a hand or a splayed star shape.
Pyukumuku tends to find a spot it likes and stay there, even to the point of starvation if food becomes scarce. People in Alola have taken to throwing such hunger-stricken Pyukumuku back into the sea where they can find food. Some people in Alola also find work clearing Pyukumuku from areas tourists frequent, who usually find them repulsive. However, Pyukumuku will always return to its favored spot. A viscous fluid coats Pyukumuku's body that allows it to stay on land for a week without drying out; people in Alola use this fluid for skincare. It hates having its mouth or spikes touched, and if it is stepped on, it will spit its fist-like organs at the offender.