Capricane

Posiathan (Japanese レヴィツン Levitune) is a new dual-type Water/Poison Pokémon making its debut in Pokémon Midnight Sun. It is the final evolved form of Oculure, one of the three starter Pokémon in the game.

Physiology
Gorgolith resembles a cross between a mermaid and a sea serpent. It has four arms with claws at the end and snake-like tentacles for hair. It also has a coral crown similar to the King's Rock.

Gender differences
The female has no beard and shells on its chest.

Pokédex entry
It was both revered and feared by the ancient Greeks and Romans. Many worshipped it as the deity of the oceans.

Origin
It is based on a mermaid and on Poseidon, the Greek god of the sea.

Name Origin
The name Posiathan is a portmanteau of Poseidon and leviathan, a mythical sea monster mentioned in the Bible. Its Japanese name is a combination of levitahan and Neptune.