[@Prints Avoid] Whoop!
[@c3p-0h]

I'd meant to bring this up earlier, but other things grabbed my attention xP
I agree, I think it should generally be 3-5 miles for a route. Cities are more along the size/population suggested in the anime/manga. 
But I'd like to bring up the fact that traveling off route (so the forest between Route 119 and 120 (south of Fortree City)) to be open for travel (the same goes for all other areas the game cannot take you). It'd be more wild and thickly forested, so it's not travel friendly (hence the purpose of Routes). For example, a character I made for this lives in a cabin north of Petalburg City and Route 102. These areas can be given their own names (like instead of Petalburg Woods, it could be Petalrusturf Forest (as the crudest of example names)). But that would, more or less, be up for everyone to contribute towards should the want or need arise.

I just had a thought, however. Since no one's really exploring Gyms and such, would everyone be okay with my establishing their locations, and possibly leaders? It would just give everyone the chance to be able to seek out a seasoned trainer or the possibility of interacting with them should the want arise.