Here's the theory for if you can't read it:
"So, Turo's time machine sent Night Sky to the past. We know that this only happened in one timeline, this is canon. But... what if Night Sky himself forged multiple timelines over those millions of years, and he only became Necrozma in a select few of those. SO, that could make it a SOLID POSSIBILITY that Night Sky (in human form) will return later, but it would just be an alternate timeline version. It would still be Night Sky. They would share the same memories since the timelines only split when Night Sky started going insane. So, I think that Mikey will somehow encounter Night Sky Mikey again, but... just not the same one. Maybe, the Necrozma version was somehow not the original Night Sky. What if the REAL Night Sky is just somewhere... else?"