Shellos is a sea slug-like Pokémon whose appearance changes drastically depending on the sea it is found in. However, both forms have amorphous, slug-like bodies. Like real sea slugs, they have mantles covering the top halves of their bodies. Unlike real sea slugs, they have bulbous heads and four small feet rather than one large foot. Both forms also have black oval-shaped eyes, tiny noses, wide yellow lips, and yellow outlines around their eyes and mantles. In the West Sea form, the underside is white and the mantle is pink. The mantle has several small spike-like protrusions on it. On its head is a ring of pink fleshy knobs resembling the gills of a nudibranch. West Sea Shellos's appearance is theorized to have been influenced by warm ocean waters. (Source: Bulbagarden.net, CC BY-NC-SA)