It’s covered in a slime that keeps its skin moist, allowing it to stay on land for days without drying up.
Ability
Pitch a Pyukumuku: Once during your turn, if this Pokémon is in your hand, you may reveal it and put it on the bottom of your deck. If you do, draw a card. You can't use more than 1 Pitch a Pyukumuku Ability each turn.