Spikemuth

This Poké Mart is located inside the Pokémon Center.

Cashier
Poké Ball 200	Great Ball 600
Ultra Ball 800	Potion 200
Super Potion 700	Hyper Potion 1,500
Max Potion7 Badge 2,500	Full Restore8 Badges 3,000
Antidote 200	Burn Heal 200
Ice Heal 200	Awakening 200
Paralyze Heal 200	Full Heal 400
Revive 2,000	Repel 400
Super Repel 700	Max Repel7 Badges 900
Poké Doll 300

Spikemuth Gym スパイクジム Spike Gym
Location	Spikemuth
Gym Leader	Piers Marnie (Successor)
Badge	Dark Badge
Dominant Type	Dark
Region	Galar
[[File:{{{battlefield}}}|250px]]
Battlefield

Spikemuth is the only leg in the Gym Challenge without a stadium or a Power Spot to facilitate Dynamax. Instead, the player's Gym mission begins soon after passing the Pokémon Center, where they must fight a gauntlet of Team Yell Grunts, who reveal themselves to be the Gym Trainers of Spikemuth and formed Team Yell to support the Gym Leader's younger sister Marnie. Occasionally, a Kantonian Mr. Mime will block the path with an invisible wall, forcing the player to defeat a Grunt before they can proceed. The battle against the Gym Leader, Piers, takes place at the battlefield at the end of the town.

During the post-game, Marnie is revealed to have accepted her older brother's request to replace him as the Spikemuth Gym Leader, and can be challenged to an exhibition match at the Gym once per day.

Spikemuth has a population of 29, making it the third-smallest settlement in Galar in terms of population after Postwick and Freezington.

Spikemuth first appeared in PASS23, when Henry and Casey entered it. Soon after entering, a Golisopod and a Bronzong came after them, with their Trainers using communication devices attached on them to demand they hand over the data card that held information about their plans. However, when they found out that the data had been too corrupted by their earlier attack on the card for the remaining information to be any threat to them, they started to leave, only for Casey to demand they return the Pokémon they had stolen from her a year earlier in Slumbering Weald. When they refused, Casey attacked the Pokémon with her Raboot and destroyed the communication devices on them, forcing their Trainers, Sordward and Shielbert, to talk to them directly and thus unwittingly reveal their location to Piers's accurate ears. They revealed that they had stolen Casey's Pokémon due to her full strength posing a threat to their plan, as Zacian and Zamazenta had taken an interest in her and Henry.

After Sordward and Shielbert had left, Leon contacted Piers and told him how Sonia had found out that the two self-proclaimed celebrities were working together with Chairman Rose to bring about the Darkest Day. As such, an agreement was made to put the Gym Challenge on hold and have all the Gym Leaders gather at Rose Tower to verify the information.