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Nah. Hoenn and Sinnoh are Kyushu and Hokkaido, which are mostly cut off on this map. Only the westernmost tropical city would be Hoenn, and only the snowy town in the northeast corner would be Hoenn.
Also, Johto has some of Shikoku in it with Cianwood City and the HGSS Safari Zone, so the pink town in the lower left part of the map would also be Johto.