Thieves are afoot. One wants to steal Diamond's Pok?dex. Another wants to steal...Lady! Can Pearl and Diamond protect her...as well as an entire city?! Then join our trio as they follow in the footsteps of a scientist who researches Pok?mon footprints. Meanwhile, what is Team Galactic planning to do with that machine they just invented...? Plus, meet Riolu, Skuntank, Gible, Hippopotas, Kricketune, Skorupi and many more Sinnoh Pok?mon friends!