Phione is a blue Pokémon with a round head and a tiny body. Phione's head is crowned by a flotation sac with a long, ribbon-like antenna. Its mouth is small, and its eyes are large with blue
sclera and gray irises. Above its eyes are two blue, circular markings connected to the eyes by a thin black line. Its long, flipper-like arms have rounded tips. Phione has a red, oval gem on its chest and a single rudimentary foot spike.
Phione inflates the sac on its head to drift in the water and search for food. When the water grows warm, it will drift in packs with other members of its species. No matter how far it has drifted, it will always return to the place where it was born.