https://www.polygon.com/pokemon-go/2018/1/12/16885896/pokemon-go-kyogre-raid-battle-sapphire

Pokémon Go players can now fight against Kyogre, the water-type legendary from the Hoenn region. The Pokémon will be featured in Raid battles worldwide from today, Jan. 12, through Feb. 14 at 1 p.m. PT.

Kyogre first appeared in Pokémon Sapphire, the 2003 Game Boy Advance game. The Pokémon was its cover star, in fact; it was complemented by Pokémon Ruby’s Groudon. Groudon came to Pokémon Go back in December. Its Raid battle launched alongside the release of several third-generation Pokémon, the most recent set to be available in the mobile game.