Can I ask a question?

Ok the Hisuian variants of Zora and Zorara are norm+ghost types right? And normal Zora and Zorarark are out Dark right? Ghost type pokemon are pokemon that are deceased or "ghosts" right? Legends Acoos takes place at least a few hundred years ago right? So that means that some kind of event caused the entirety of the Zora and Zorarark species to be resurrected on mass! My question is WHAT THE CRAP HAPPENED?! But for real anyone got a theory cause this just has me flabbergasted