The Shapeshifting Metamon, Find that 'mon!

Our heroes visit Aether Paradise, part of the Aether Foundation run by Lillie’s mother, Lusamine. An impressive variety of Pokémon live in the conservation area, including a group of Ditto who need their shots! Professor Burnet recruits Ash and friends to help with the vaccinations while Lusamine is busy on the phone, but one of the Ditto escapes and leads our heroes on a merry chase as it keeps transforming. They eventually catch it when it disguises itself as Snowy—and Lillie realizes she can’t touch it! Meanwhile, the Team Rocket trio has scored jobs at Aether Paradise, and they’re hot on Nebby’s trail when they stumble into Faba’s mysterious laboratory…