Dewgong is a long, completely white Pokémon. It has billowing fins. There is also a horn on its head that is useful for bashing through thick ice. It is somewhat just a more elegant version of seel.
Dewgong can have the ability Thick Fat or the ability Hydration. Thick Fat gives Dewgong resistance to Fire or Ice-type attacks. Hydration allows any status condition to be healed when it is raining. Dewgong are well-adapted to the frigid temperatures of their environment.
Dewgong is the evolved form of Seel, as of level 34.