Moon had to deliver Rotom at Professor Kukui's laboratory. She let it stay outside and travel along with her. On their way to the lab, they encountered Sun, who had let loose a Pyukumuku while working as it released its slimy contents on Moon's face, and were informed by him about Pyukumuku and his part-time occupation of clearing them from the beach. Later, it witnessed the duo of Sun and Cent defeat Team Skull Grunts and their Pokémon.
None of Rotom's moves are known.