>>38010072>Alolan Ninetales cannot live in other regions with snow routes or Alolan Rattata is exclusive to Alola thinking they cannot have nocturnal habits in any region except AlolaThey can, but to do that a good number of them would have to reach those regions in the first place, and adapt to the new area without competing with native mons. And the most likely way for that to happen in a reasonable timescale is by human influence (or by magical legendary pokémon fuckery given the setting).
So unless someone actively brings some A-Ninetales or A-Rattata to other regions and breed them (like they did with Yungoos), they'll probably not be found in the wild. That's why the Safari Zone would be a good way to put them in other regions.