Young Pokémon trainer Ash Ketchum and his loyal friends journey to the beautiful mountain town of Greenfield, where they will encounter the Unown, the most mysterious of all Pokémon. Unown are 26 cryptic entities shaped like letters of the alphabet that have the power to bring human thoughts and dreams into reality. It is the Unown that create a challenge for Ash far greater than any Pokémon battle he has ever experienced before.