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Regarding Necrosolgaleo & Necrolunala's appearance.
It seems to be that it either could be a symbiotic relationship between Necrozma & its counterparts, since Solgaleo & Lunala appears to get remnants or all of Necrozma’s husk/shell as armor. The armor will benefit them and probably in-game give them a boost to their BST. (Maybe the armor or remnants of Necrozma will corrupt Solgaleo/Lunala, though and it is evil hurrhurr)
Given how Necrozma’s idle animation suggests that it is in pain or tries to remember something, it could potentially be helpful for it to lose its husk and reveal its “true” forme so that it no longer would be in pain or in amnesia.
This theory/speculation is far from new, but it is somewhat intriguing.
Thoughts? Discuss