After her father vanishes while investigating the enigmatic Unown Pokémon, Mii Snowdon finds solace in a set of mysterious tiles that lead her to a wish-granting encounter. As she yearns to reunite with her missing father, the Unown heed her call and summon the majestic Entei to masquerade as her paternal figure. Concurrently, Satoshi embarks on a journey to Greenfield alongside his loyal Pikachu, only to stumble upon a petrified landscape wrought by the Unown's power. In a bid to restore the crystallized expanse to its former splendor, Satoshi, Kasumi, Takeshi, and their Pokémon allies must engage in a high-stakes battle against the Unown. Matters escalate when Entei abducts Satoshi's mother, propelling the group into a personal quest across the frozen terrain to confront the mythical lion and the cryptic Unown, unraveling the mystery behind his mother's abduction.