Kyogre

Kyogre is a Water-type Legendary Pokémon from the Hoenn region. It doesn't evolve into nor from any other Pokémon. Along with Groudon and Rayquaza, it is a member of Weather Trio.

Trivia

 * Kyogre was available in Raid Battles from January until February, 2018.
 * Kyogre was available again as Raid Boss, during the Legendary Week, from February to March, 2018.
 * Kyogre was available again as Raid Boss, during the Water Festival, from June to June, 2018.
 * Kyogre was available again as Raid Boss, during the Water Festival, from June to June, 2018.