The Isle of Armor

Spoiler warning: this article may contain major plot or ending details.

After obtaining the Armor Pass, the player can board a train at the Wedgehurst Station, from which they transfer to a Flying Taxi that takes them to the Isle of Armor. Upon arriving at the island, the player encounters a man who is supposed to start as a student at the local dojo, but is nervous because of the strange person waiting for him. As the person, Klara^Sw/Avery^Sh, enters the station, the man is scared away, and the person mistakes the player as the new student. Puzzled by the player's denial about being a new student, they challenge them to a battle. After being defeated, the rival decides to ask the player to leave to avoid endangering their own career at the dojo. As the player arrives at the Master Dojo, they catch the rival lying to the dojo's matron, Honey, about the player leaving, and is welcomed by Honey as a new student at the dojo.

At the dojo, the player meets the dojo's leader and Honey's husband, Mustard, who challenges the player to a quick battle. Once the player has won the battle, Mustard declares that the dojo is at max capacity and initiates the "three trials", the winner of which will be given the "secret armor" of the Master Dojo. The first trial is revealed to be chasing after and defeating three fast Slowpoke across the Soothing Wetlands after they steal the rival's Dojo Uniform. After the player defeats all three Slowpoke alone, Mustard lets everyone who at least managed to catch up to the Slowpoke a pass, granting most of the students access to the second trial. The second trial involves finding Max Mushrooms for the dojo's secret recipe, the Max Soup, which allows certain Pokémon to Gigantamax. Upon finding Max Mushrooms in the Warm-Up Tunnel, the player is challenged to a battle over them by the rival. After winning, the player is able to collect the mushrooms and return to the dojo, where they and the rival are revealed to be the only ones who were able to pass the trial. The last trial is a Dynamax battle between the player and the rival at the dojo's Battle Court. The player emerges victorious, despite the rival trying to resort to cheating to win, granting the player the "secret armor" of the Master Dojo: the Legendary Pokémon Kubfu.

After the player has obtained Kubfu, Mustard tasks the player with raising its friendship. While the player may use any method, Mustard recommends that the player take Kubfu to visit various spots around the island. During this time only, Master Dojo Students will be present at Brawlers' Cave, Challenge Road, Loop Lagoon, and Potbottom Desert and will offer the player and Kubfu a view of the scenery. Visiting all four guarantees that Kubfu's friendship will be sufficiently high. Once they've become the best of friends, Mustard tells the player to choose one of the Towers of Two Fists, the Tower of Waters or the Tower of Darkness, and challenge it with Kubfu. Regardless of which tower the player chooses, Mustard will be waiting at the top floor, ready to challenge them with his own Kubfu. After defeating Mustard, the player can let Kubfu examine a special scroll that allows it to evolve into Urshifu.

Once the player has evolved Kubfu, become Champion, and stopped Sordward and Shielbert, Hop shows up at the dojo as part of his research as Sonia's assistant. Mustard tells the player that Urshifu hates the taste of Max Soup, so, in order for it to unlock its Gigantamax potential, a special ingredient is needed to make it drink the Max Soup. He doesn't reveal what this ingredient is, though, and lets the player and Hop figure it out on their own. After failing to find a proper ingredient out of Lilligant and Applin nectars, Hop figures that the ingredient must be honey. He and the player travel to Honeycalm Island, where the player gets thrusted into a Max Raid Battle against a Dynamax Vespiquen. After defeating it, the player will obtain a comb of Max Honey, which is the missing ingredient.

Upon the player's return to the dojo with the news of finding the key to unlocking Urshifu's Gigantamax potential, Mustard informs them that he wants to battle them in a no-holds-barred battle, where he uses his full power. In the battle, Mustard uses his own Gigantamax Urshifu. After being defeated, Mustard declares that he has nothing more to teach the player, ending The Isle of Armor plotline.

	Spoilers end here.