Having learned that Professor Oak is to be on a nearby island, Ash & Co. decide to stop by to help him with his research. On the island, they learn it is filled with the Pokémon, Rotom, and Professor Oak is on the island to fully research Rotom's special form changes. As they arrive in the area, they soon find three Rotom and try to see what electricity the Rotom enjoy. However, Rotom soon decides to change its form and starts to cause chaos. Will Professor Oak get what he needs, or will Team Rocket stop him from fulfilling his research?