Empoleon was first seen as a Piplup when Platinum let her out of her Poké Ball to choose her as her starter at the start of the Diamond & Pearl arc. Later on at Oreburgh City, Piplup had lost her ego when she failed to protect Platinum at the Oreburgh Mine, but regained it after winning the battle against Roark with a Water Pulse. While training in Eterna City for Platinum's Gym Battle with Gardenia, Piplup evolved along with Tru and Chimler as Cynthia walks past them, and managed to secure a win against both of Gardenia's Pokémon with a deceptive use of its Blizzard. Prinplup later competed in Platinum's first contest in VS. Pachirisu.