I think I figured something out, but it could just be from lack of sleep. Anyway, given that Alola is the first region to really have different typings on a single species, as well as type different variations, and strong elemental ties to a type in different regions, I think it might be where evolutionary stones are either imported from, or found in the highest quantity. The mountains that our ice shifted vulpix and sandshrew could radiate the same kind of energy that allows eevee to become glaceon, for example. The islands could act as...I want to say fire, thunder, dusk, and either sun or moon stones in certain locations, or to certain pokemon, with water stones being beneath the sea. The guardians may be cause or effect of this too, either charging their islands with their energy so much that it causes the land to take it on and changes what lives on it, or being born because the islands had such abnormal amounts of this energy in the first place. Hell, the Oricorio pokedex entries say they are different because they fed on the sap of trees on the different islands, which supports the game lore idea that the region has some form of super charged effect relating to typing.

Anyway, thoughts for or against? Does it have merit, or am I so dumb that I should have spent my time while doing manual labor at work distracting myself in other ways?