As the Millennium Comet approaches, promising to fulfill the desires of those who witness its celestial show, Satoshi and his companions eagerly anticipate the Millennium Festival. Their intrigue peaks during a magic spectacle by the enigmatic Great Butler, who harbors a mysterious cocoon that speaks to Masato. Upon the awakening of Jirachi from its slumber, a fleeting friendship blooms between Masato and the mythical being until the comet vanishes. With time fleeting, Masato cherishes his bond with Jirachi, but the Great Butler’s sinister intentions to use Jirachi to awaken the destructive Legendary Groudon threaten their brief companionship. It's a race against time for Masato, Satoshi, Haruka, and Takeshi to thwart Butler’s plans, safeguard Jirachi, and prevent Groudon's cataclysmic return.