There don't have to be a particular area to find a certain type. Litleo a fire type, for exemple, is found on route 22 in XY, and yet there's no volcano in the route.
Just because Iwanko is a rock type doesn't mean it can't be found in non cave areas.
Most likely because Unova, Kalos and Alola are all based on contries/part of a country that are far away from Japan (the basis for Kanyo/Johto/Hoenn and Sinnoh).
Guys, just because there are palm trees in the concept art doesn't mean that the region itself is ''tropical''. Both Egypt and Spain are associated with palm trees, yet I don't think anybody calls them ''tropical'' countries. Palm trees range into the subtropics and even further north/south than...
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