Team Yell (Japanese: エール団Yell-dan, literally Yell Gang) is the villainous team in the Galar region. They are fans of Marnie who want her to become Champion. However, despite the good intentions of their leader, Piers, to form a fan club of sorts to cheer on his younger sister, the grunts begin to take things too far by rudely obstructing her rivals in their Gym Challenges and doing anything to prevent them from becoming Champion instead of Marnie.
In the games
In Pokémon Sword and Shield
Team Yell obstructs Marnie's rivals by taking over hotel lobbies, preventing challengers from accessing transportation, and even shouting and distracting opponents during battle.
Team Yell is the first villainous team with no specific evil intentions or goals. Instead, their only desire is for Marnie to become Champion.