Poseidon is a Face Bolt that was never actually released by Takara Tomy or Hasbro but a sticker sheet was released with an issue of CoroCoro Comic.
Description[]
The Poseidon Face Bolt depicts "Poseidon". In Greek mythology, Poseidon was one of the twelve Olympians and the god of the sea. The Face Bolt design depicts Poseidon's face with various trident-like protrusions at the back of his head.