>>42555062World History is where things start to get fucking wacky. Questions like "how did Zubat influence the decimation of Native American tribes," "why didn't Gallade stop Hitler," or "What role did Pokemon play in the rise and collapse of the Roman Empire" are honestly the least of our worries here.
You have creatures that can fly across the globe in a week, that can swim through the most violent oceanic storms, and can teleport themselves and others at will.
Human migration is going to be completely fucking bonkers, and Unova is a perfect example of this: somehow Manhattan Isle has ancient ruins buried just underneath the modern equivalent of New York City. The implications of a culture settling the region, building a civilization, and losing it in an ideological civil war spearheaded by Reshiram and Zekrom are downright abyssal, and that's before we factor in the distinctly-Peruvian Sigilyph guarding these haunted ruins. What role did Native Americans have to play in this and why are there no signs of them in the modern day?
It is fair to say that the concept of an ethnic state would be completely foreign in a world so heavily-influenced by Pokemon. Whereas instead of racism, you'd see a stronger sense of community-focused tribalism. Pokemon are the great equalizers between man, woman, and child; so it would be logical to assume that prejudices are based on the region you originate from instead of what your skin or nose looks like.
This is how you get situations like an American army veteran and a French dancer becoming community leaders in Japan, among other eccentricities like European royalty fighting alongside the Tapus against extra-dimensional aliens in Hawaii.