DJ Rotom is the Rotom character who plays music in Pokémon Pokopia.
In the story, DJ Rotom has possessed a stereo system. This gives the character a music-focused identity that fits Pokopia's relaxed, decorative approach to life in the restored world.
DJ Rotom is one of several specially presented Pokémon encountered during the adventure. Other named characters include Peakychu, Mosslax, Chef Dente, Smearguru, and Tinkmaster. These names connect familiar Pokémon species with unusual roles or circumstances.
The character is sometimes confused with the descriptive term Stereo Rotom, which was used in promotional material for the stereo-shaped form. The story name presented in the game is DJ Rotom, making it the clearest answer when asking who provides the music.