It is an enhanced version of Pokémon Ruby Version and Pokémon Sapphire Version and is part of the third generation of the Pokémon video game series. It was first released in Japan on September 16, 2004, and was later released in North America, Australia, and Europe. Pokémon Emerald Version, most commonly referred to as simply Pokémon Emerald, is a role-playing video game developed by Game Freak, published by The Pokémon Company and Nintendo for the Game Boy Advance.