>>41231636Well it would make some sense.
Kanto, Johto, Hoenn, and Sinnoh are all in the same area, so minimal divergence.
Pokemon from them are neither native to Unova nor have a long history as invasive species, so no adaptations.
But Kalos was the first region to take place far away and naturally have the same species, so logically that's when we should have seen the first widespread regional forms.