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Tomorrow's trailer is just a montage of everything that has been revealed in the last few months (about three minutes - the respective motives of URS are elaborated on though). The final 15 seconds is a cluster of clips of revealing Rainbow Rocket (grunt scenes, double battle against Alolan Sandslash and Salazzle, single battle against Crobat). It all ends with Giovanni quickly pointing his hand toward the MC, with Mewtwo at his control behind him.
My guess is Mewtwo gets freed by you, and you can catch it later on in Ultra Space.
