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Now for Hawaii/ alola. Look at the demographic and compare it to other areas. I know that the main landers have to deal with blacks a lot, but here it's not that common unless your in Honolulu with tourists/ college students, or by a military base/ housing. I doubt gamefreak would pander to such a small population. Blacks also can't really afford to live here, albeit those that due are usually well of and rather nice. This place has a lot of Asians as you can see. A sizeable white population as well. Right off the bat, a lot of people are darker over here. Normal European tier whiteness is still present, but you have a lot of people who are darker than the norm. Portugese make up a decent chunk of the white population, and they've been here since the plantation days. They're also pretty dark. Not alberto barbossa meme tier. I don't know how, but they are.
Hispanics are majority Puerto Ricans descended from the plantation days. That or the sheer weight of invasive coqui frogs on the big island. They of course are also relatively dark. I made the coqui joke because they're so inconspicuous that you don't seem to notice. That and big island kinda has a frog plague.
Japanese, Chinese, Koreans, etc are also darker. You can still find lighter ones as I've said, but all the sun does things. One of the reasons the Japanese like Hawaii so much is that there are a lot of people of Japanese descent their. They were the majority until 2012 I believe and then filippinos took the title. That said, the tourist and therefore gamefreaks mindset is still probably on pre 2012.