Poliwag

Poliwag is a Water-type Pokémon resembling a blue tadpole with a spherical body. It has large eyes, a small mouth, and a distinctive white belly with a black spiral pattern. Its tail is long and translucent, aiding in swimming. Poliwag's skin is very thin, making its internal organs visible. It is known for its swift swimming abilities and is often found in freshwater habitats.