>>28473308They will likely be summoned to aid you in your fight against the main antagonists (Ultra Beasts, the Aether Foundation, or MAYBE Team Skull). The scene at the end of the recent Japanese trailer with Solgaleo and Lunala going into a wormhole along with the Poké Ride feature has led some to speculate that they will take you to the Ultra Beast dimension for the story's climax.
