The tip of its tail, which contains oil that is lighter than water, lets it swim without drowning.
Silver
The end of its tail serves as a buoy that keeps it from drowning, even in vicious currents.
Crystal
The fur on its body naturally repels water. It can stay dry, even when it plays in the water.
Ruby
MARILL's oil-filled tails acts much like a life preserver. If you see just its tail bobbing on the water's surface, its a sure indication that this POKéMON is diving beneath the water to feed on aquatic plants.
Sapphire
When fishing for food at the edge of a fast-running stream, MARILL wraps its tail around the trunk of a tree. This POKéMON's tail is flexible and configured to stretch.
Emerald
Its body is covered with water-repellent fur. Because of the fur, it can swim through water at high speed without being slowed by the water's resistance.
FireRed
The end of its tail serves as a buoy that keeps it from drowning, even in vicious currents.
LeafGreen
The tip of its tail, which contains oil that is lighter than water, lets it swim without drowning.
Diamond
Using its tail as a float, it dives underwater. It likes eating plants that grow on river bottoms.
Pearl
The tip of its tail is filled with oil that is lighter than water, so it acts as a float.
Stadium 2
The tip of its tail, which contains oil that is lighter than water, lets it swim without drowning.
TCG
Light Azumarill: It curls up its long ears when swimming to prevent water from entering them.
Marill: This Pokémon's fur repels water like a duck's feathers, allowing it to stay dry and fluffy even in water.