The fourth volume of The Seventh Chapter, Diamond and Pearl.
Mysteries abound when a Psyduck and a Pokémon Researcher go missing. And Lady fights two epic Gym battles! If only Pearl and Diamond could stop fighting each other...!
Then, what secret does Cyrus, leader of Team Galactic, seek in the ruins and relics of Celestic Town...?
Plus, meet Carnivine, Floatzel, Magnezone, Drifblim, Mismagius, Bronzong and many more Sinnoh Pokémon friends!