Stow-on-Side Stadium is the largest building in the town and is the site at which the fourth installment in the Galarregion's Gym Challenge takes place.
In both games, during the Gym mission, the player slides down a slide in cup they can spin with the control stick to steer. Their objective is to reach the bottom of each slide while avoiding obstacles and walls, which will cause the cup to spin out of control. At the end of each course, they will battle a Gym Trainer. Behind each Trainer is a warp tile they can use to return to the top of the Gym mission area to retreat if needed. After completing three courses, their mission will be complete.