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Walrein is a large, sea lion-like Pokémon with a layer of blubber under its skin. It is primarily blue, with thin, white rings around its neck and lines on its fan-like tailfin. There are two long, ivory tusks in its upper jaw. It has a round snout and yellow eyes, and large tufts of white fur about its face and neck. Its four short legs have long flippers instead of feet.
Walrein lives in and around icy seas, where it is insulated against the cold by its thick layer of blubber. This layer of fat also protects it from enemy attacks by causing them to bounce off. It can coat its body in ice and charge opponents to use its former signature move, Ice Ball. While its long tusks are capable of crushing ice, they may break during battle. This Pokémon can be found in herds, which are fiercely protected by the leader.