Pokemon Let%27s Go Pikachu Xci ((link)) | Certified & Quick

: This optional physical controller acts as a Joy-Con and allows you to take your Pokémon for a "stroll" in the real world to earn rewards. Co-op Gameplay

A second player can shake a Joy-Con to drop into your game at any time, assisting you in catching Pokémon and tag-teaming Gym Leaders in 2v1 battles. pokemon let%27s go pikachu xci