It sounds a bit like the Indigo Plateau. There aren't many trainers out there, so it is a great place for observing wild behaviour.

[Really, he's already beaten the Elite Four, but Armin is definitely planning on going back there at some point just to see more stuff. Maybe Autumn. Autumn sounds like it could be a cool time to sightsee some more.]

Speaking of wild behaviour. Have you visited this one yet?

[Armin taps Dipper's map, right on number eight, located just a bit north of Blackthorn.]