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Due to the similarity of the eyes and the fact that the light thing is on the box art, I kinda doubt it is an UB. Well let's wait and see.
I’ve posted my reasoning on how the light thing is a UB here SPECULATION: - Mystery Pokemon Poll
And being on the boxart doesn’t prevent a Pokémon from being a UB. Solgaleo/Lunala are related to UB and Necrozma is a UB which stayed on earth for a prolonged time.