Real question what is going on with Pokémon sky?

If we look at the lore there are several different examples of meteors coming from the sky and creating like a legendary Pokémon or area zero I mean Deoxy obviously is our first example, but then we have stuff like the a area zero and eternitieus but I think even Kyurem so what is going on here and I mean I don’t I would I don’t count ultra spaces actual space, so what is going on