There is nothing game breaking about it. Actually it mimicked how evolution works in the real world as well. Humans are all from the Middle East in the beginning, but we slowly moved through the world and adapted to our environment, and that is why the Chinese look different than Europeans and why people from Africa…

Pokemon design will never again reach the peaks of Alolan Dugtrio.

I don’t think this is considered evolution. Exeggutor is basically a sentient plant. Plants grow differently in different climates.