Ash and his classmates go on a camping trip in the forest. The trip does not start out well when Lana scares them all with a ghost story about a traveler who had all his energy drained from him while he was asleep. However, they have no idea that they are being spied on by a mysterious Pokémon. One by one, the gang except for Lillie is attacked, knocked out, and their energy drained from them. The culprit turns out to be a hungry Morelull. Ash figures out a way that the Morelull can get all the energy it needs from him, and later the gang finds out why the Morelull need so much energy.