Ghough City

Ghough City is the capital of the Toh region, but due to suspicious activity by Team Nose, its gates were closed until you beat the 5th gym in Qnicapous City. To get from Route 7 to Route 8 or from Route 9 to Route 10 without going through Ghough City, two Underground Paths were built. They were meant to cross eachother so that you can get from any of those routes to any other one, but Underground Path 2 was built more underground than Underground Path 1 was, so they didn't cross.

You have to clear the events in the Snus Factory before you can battle the Gym here. Also, beating this gym allows you to use the Surf HM you need to get to Route 11 from Qnicapous City.