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Pokemon, like Naruto might pick up cues from existing world cultures, but doesn't necessarily follow its rules. So in the Japan-inspired areas, they've become a melting pot over the years unlike real life Japan (though some trainers like Sabrina, Falkner, Janine, Bugsy, Pryce and Erika are full-blooded natives). Incidentally, Kanto/Johto is recognized as a world superpower.