Hulbury Stadium is the largest building in the town and is the site at which the second installment in the Galarregion's Gym Challenge takes place. It is located at the northernmost part of the town. Like most Stadiums in the region, the Hulbury Stadium contains a Poké Mart and a uniform shop.
During the Gym mission, the player is required to navigate a maze that is partially blocked by falling streams of water.
There are a number of pairs of colored pipes and grills throughout the Gym. There are a total of three different colors: red, yellow, and blue. When activated, water falls from the pipe and runs through the grill, blocking the player from crossing that grill; when deactivated, the player can freely cross the grill. Initially, some of the pipes are activated, some are deactivated.
There are a number of colored switches throughout the Gym; pressing one of these switches activates all inactive pipes of the same color, but also deactivates all active pipes of the same color. The player has to press the switches in order to navigate the maze and reach the door at the back of the Gym.
The player can withdraw from the Gym mission at any time by returning to the entrance. If the player loses a battle or withdraws, the mission is reset; however, defeated Gym Trainers cannot be battled again. Once the player has completed the Gym mission, even if they leave or lose, they proceed straight to the Gym battle from the reception area.