When she appeared for battle against Platinum, Medicham was seen and when the format on the screen to switch both trainers Pokémon explained by Dahlia too.
As they were switched, each trainers Pokémon were seen on the opposing side of the field. When Platinum told Medicham to check to aura's of her Pokémon, it was shocked to see how strong they were. It fought against Platinum's Empoleon, which was defeated offscreen.
As a man was speaking to the robot Starley, he mentioned that the Battle Arcade was closed, to the shock of the robot Starley. He explained that because Platinum defeated her, she went training, with an image of her and her Pokémon.
None of Medicham's moves are known.