>>27130258But all the Pokemon Centres not in cities aren't in the middle of nowhere, with exception of the obvious Victory Road portion of the map just right to this Slaking Motel. The centres I think you're referring to are actually near points of interests, not the middle of nowhere. Post some screenshots so I know what you're talking about specifically.
Unrelated, here's another motel. This one's near an apparent point of interest (berry farm) so it's not exactly in the middle of nowhere, but it's clearly a place to rest during your long and treacherous journey up this giant route.