As you can see, with a Google Maps image overlayed onto the CoroCoro scan, Isshu’s map does match up pretty well to the real life New York area (image kindly provided by DarKnighT_0_9 of PokeCommunity). Of course there’s no way to be 100% certain unless a developer says so, but this does look pretty close. An hour after the scans leaked 2ch was already narrowing down the real world location it was based on and their general consensus was NYC as well.
Of course I’ve seen other suggestions across the fandom as well 🙂 Thoughts?
<3 pokejungle