Ash, Misty, and Brock are traveling along when they notice a strange shape falling from the sky. They run in to investigate, but soon realized that they were not the only witnesses of this event. Two representatives of an organization devoted to uncovering secrets of the Pokémon world arrive just as our heroes discover that the mysterious falling object was a Cleffa. Though these two Pokémon buffs seem a bit eccentric, Ash and friends share their interest in discovering from whence this Pokémon had come, and so they join forces in investigating a mystery that may shed light even on the very origins of Pokémon life on their planet.
