Ditto is Duplica's partner Pokémon. It can copy any Pokémon it goes up against. At first, it had a slight problem: Every time it copied a Pokémon, Ditto always kept its own face. It was captured by Team Rocket to be transformed into a Dratini. However, it has a little fun at Jessie's expense. After being threatened, it molded its face into Meowth's when it imitated him, a perfect match. After a touching moment, Team Rocket "gave" Ditto back, but Duplica could tell it wasn't Ditto. After getting it back, Duplica and Ditto said their goodbyes to Ash and co.
Like its trainer, Ditto appeared in the opening scene of Adventures on the Orange Islands.
It appeared again in Johto, along with Mini-Dit, its "little friend".
- Ditto demonstrated that it was able to transform into non-living objects, such as a picture, a book and a cannon.