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Shellos have two different appearances: West Sea (pink and white) and East Sea (blue and green), found on the respective sides of Sinnoh's mountain range.
Shellos is a slug-like Pokémon whose appearance changes drastically depending on where it is found. However, both forms have a shell-like back and an amorphous lower body. Both forms also have yellow lining around their eyes, mouth, and back.
In the West Sea form, the underside is white and its shell is pink. The shell has several small spike-like protrusions on it. On its head is a ring of pink fleshy knobs resembling flower petals that spike up.
In the East Sea form, the underside is green and its shell is blue. The shell has two flap-like protrusions. These flaps are lined in yellow. On its head are two white-tipped knobs resembling horns that extend away from its face.
The Nurse Joy featured in Gateway to Ruin! revealed Mt. Coronet's formation led to the allopatric speciation event, with the original population of Shellos being separated into two. As a result, Shellos' color and other physical differences began to vary due to environmental differences and population isolation over time. The two forms are still able to interbreed; the child takes the mother's form or the father's if bred with a Ditto. If it is pushed or squeezed, a mysterious purple fluid will ooze out of its body. In the anime, West Sea Shellos can extend their necks to incredible lengths. It is unknown if the East Sea form can do this as well. Shellos live along the sea shore.
Three Shellos, two of them West Sea and the third East Sea, appeared in Deceiving Appearances!, where they were among the Pokémon seen at Aether Paradise.
Shellos, the Sea Slug Pokémon. Shellos's shape and color varies depending on where it lives. Two different varieties have been confirmed in the Sinnoh region.
Shellos, the Sea Slug Pokémon. A mysterious purple fluid oozes out of its soft body when Shellos is strongly squeezed. Two kinds of Shellos, pink and blue, have been confirmed.
Shellos's most notable appearance is that of a companion of Mr. Fuego's. He typically keeps his East Sea Shellos on his shoulder, continuing to do so even after he accidentally imprisoned himself to avoid Team Galactic. It first appeared in Maddening Magby.
Both Shellos and Gastrodon have early back sprites that can be found in the game data for Pokémon Diamond and Pearl; however, there are no front sprites for these forms.
Prior to Generation VI, Shellos's body style was .
Shellos is the only Pokémon with Sand Force that benefits from its Sandstorm immunity, since the other Pokémon are naturally immune to its damage due to their typing.