Thread:MMYP999/@comment-27109830-20171030064428/@comment-27416494-20171124220630

Both of them are the main driving forces behind the alternate retellings of popular 3DS JRPGs. They were once benevolent draconic creatures (yes, for the record, Necrozma's true form is part dragon) who were once responsible for granting great bounties of light and leadership to humanity in the past. At some point, they were driven to madness and isolation due to Anankos's innate draconic nature and the actions of greedy humans who sought to steal the light of Necrozma. Their true forms were lost or at least greatly weakened over the course of these events, due to the incarnation of Anankos's good conscience separating from his body and parts of Necrozma's body being broken off altogether. These broken pieces would incidentally go on to become a great source of power to the protagonists of their respective stories (to be specific, Anankos's blood was what allowed the royals of Nohr and Hoshido to use Dragon Veins, and the scattered light of Necrozma was apparently the source of all Z Power in the Alola Region), which would play a key role in the ultimate defeat of both creatures.

In spite of residing in alternate dimensions far removed from the "normal worlds" of their respective settings, both of them still posed a great threat to these worlds due to their inherent abilities to cross the boundaries of spacetime. As such, the survivors of their great rampages would go to great lengths to gain the aid of the residents of Nohr, Hoshido, and Alola as a means of putting a stop to the two mad deities.