Pokemon Sun and Moon (AKA SUMO) have two legendaries as of today - Solgaleo and Lunala. As you may have guessed, sunnier of the two will appear in the Sun version of the game, while the Lunar pokemon will appear in Moon. Despite their names, they will not be Sun Type nor Moon Type - nor any sort of astronomical sort of type. Solgaleo is a psychic/steel Pokemon and Lunala is psychic/ghost Pokemon. Both will be fully identified only when the game has been released, as it always is.