#183 in the National Pokédex, Marill is an Aqua Mouse Pokémon covered in water-resistant fur, allowing it to swim through the water with the speed of a rodent on land. Its tail is filled with a light oil, allowing it to act as a life preserver for Marill. It is naturally a Water-type, as well as being given a secondary Fairy-type following the type’s discovery in the Kalos region.