Route 4 is a desert road linking Castelia City to Nimbasa City, with the entrance to the Desert Resort located in the northwest. Despite being a desert route, a small beach is in the southwest. There's an overhanging bridge in the north side where you'll see trucks passing. Due to the constant sandstorms, construction work is still ongoing and the route is incomplete. Many of the Workers are scattered around waiting for a battle to pass the time.