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They have access to the portals and likely the dimension UBs come from, how the hell can they NOT be related to the story? If anything, this is the first time since DP, which was the only time actually, that both the legendary box mascots and the trio are tied to each other in the plot. Not to mention that Solgaleo and Lunala apparently have more influence then the other depending on the version, and are apparently well known enough from before the start of your journey, compared to previous legendaries which were all ambiguous and shit to create mystery. I'd dare say they might even have more of a presence then ever before.