Team Yell

Team Yell obstructs Marnie's rivals by taking over hotel lobbies, preventing challengers from accessing transportation, and even shouting and distracting opponents during battle. When the player reaches Spikemuth, it is revealed that Team Yell Grunts are actually Spikemuth Gym Trainers in disguise, and that their leader is Piers.

Team Yell are first encountered in the lobby of the Budew Drop Inn in Motostoke, preventing Gym Challengers from signing in to the hotel. After Hop and the player defeat them in battle, a Trainer named Marnie appears and tells them off, explaining that they're her belligerent fans who often go too far in their support of her.

The player next encounters Team Yell on the bridge in Route 5, harassing a man in an attempt to force him to give them his Rotom Bike, claiming they need it to cross the bridge and chase down Gym Challengers. Once the player defeats them, they run off and the man gives the player the bike as a reward.

In Galar Mine No. 2, the player runs into Team Yell again. Two Grunts ask the player if they’re a Gym Challenger and ask to battle. However Hop shows up, which irritates the two, especially when he claims that he will be the next Champion of Galar. Hop then offers to battle them to prove that he’s serious, asking the player to help him in a Multi Battle. After the grunts are defeated, they leave quietly.

The player next finds Team Yell at the beginning of Route 6, admiring a sleeping Silicobra and blocking the entrance to the rest of the route. They tell the player that it is their duty to ensure the Silicobra can sleep peacefully. When an old woman asks to walk past, claiming she’ll make sure not to wake the Pokémon, they allow her through. However, when Hop arrives and asks to let through, the Grunts state that Hop and the player are too loud and will wake up the Silicobra and refuse to let them pass. The player then battles both Grunts, who run off once defeated.

On Route 7, a pair of Grunts can be encountered blocking the eastern entrance to Route 9.

Team Yell are next encountered on Route 9, near a Drednaw and the man who gave the player the Rotom Bike earlier. They attempt to prevent the player from riding on the Drednaw and crossing the water to Spikemuth. The man claims he can make Rotom Bikes ride on water, however, the Team Yell Grunts ignore him. He asks the player to battle Team Yell for him. Once the player defeats one of the grunts, they both get on the Drednaw and ride away.

The player arrives at Spikemuth’s entrance only to learn that Team Yell is blocking Gym Challengers from entering the city. However, Marnie leads the player to an opening in the side of the city and leads them inside after the player defeats her in battle. During Spikemuth's Gym mission, the player fights several Team Yell Grunts. However, one of the Grunts the player fights forgets to put on his disguise and it is revealed that the Team Yell Grunts are actually Spikemuth Gym Trainers, who are trying to help Marnie become Champion in the hopes of it improving their hometown's run-down condition. The player then battles Team Yell's Captain and the Spikemuth Gym Leader, Piers, and earns the Dark Badge from him.

In Wyndon, when the player is attempting to gain entrance to Rose Tower, Piers and Marnie lead a group of Team Yell Grunts to assist the player in finding and defeating the League Staff member with the key they need to do so.

In The Gathering of Stars, Two members of Team Yell appear on a cameo during Marnie's invitation to the Galarian Star Tournament.

Team Yell debuted in the Sword & Shield chapter. Two Grunts attacked Henry and Casey in an attempt to destroy their Gym Challenge uniforms. Their plot was foiled when Henry and Casey dragged the Grunts into a nearby Pokémon Den, forcing the four to team up in a Max Raid Battle against a Dynamax Gurdurr.