Pikachu's Exciting Adventure!

After Ash & Torracat inadvertently got sent into the past by Celebi, Pikachu and the others are unaware and can't find Ash so decide to start searching for him. Their search takes them to the Pokémon School, Ultra Guardians base and even in the sky with Garchomp. What adventures await Pikachu and the other Pokémon, and will they be able to find Ash?