Makina's Ditto, Number 2, is a teal colored Ditto that transformed into Piplup and Pikachu. Her Ditto's had wandered away from her and started causing trouble for Ash and his friends as they were transforming into their Pokémon and making them mad.
During a battle with Ash, it transformed into Infernape but was no match for Ash's Infernape.
Team Rocket stole the Ditto's and planned to give them to the boss but Ash and his friends were able to recover both of them.