Psychic energy thought to belong to Mew has been detected on Cello Island, and Ash and Goh leave immediately, hoping to find Mew. Arriving at the island, they meet up with lots of different Pokémon (many of which Goh immediately catches) and encounter the legendary Clone Pokémon Mewtwo. Goh announces his determination to catch Mewtwo, and when Ash asks battle Mewtwo it agrees to face them both at the same time. Aided by Pikachu, Lucario, and Cinderace, Ash and Goh begin their toughest battle yet against the strongest Pokémon of all with their dreams on the line! (Source: Wikipedia)
