>>50322822Me and my brother both put a few hundred hours into Diamond and Pearl, and we thought we had done everything. But this one time checking the ingame map I happened to see a new location name that neither of us had found before 'fuego ironworks'.
That's probably my favorite memory of exploration in pokemon. Maybe there was some npc that mentions it, but we found it completely by chance and it was magical.
The hidden grotto's in BW2 evoked a similar feeling, as did volcarona's temple in BW.
Honestly I think there is less mystery now, but certainly the internet has reduced that too.