Pokémon Adventures: Diamond and Pearl/Platinum Vol 10

From the VIZ Media edition

Lady faces a new Pokemon battle challenge when she must swap her Pokemon with her opponent and fight with rented Pokemon. Meanwhile, the Battle Frontier begins to suffer from a mysterious communications malfunction... What does it signify? Then, Dia and Pearl set out to visit several Legendary Pokemon of the Sinnoh region. Will they be able to protect them from Team Galactic? Plus, say hello to Togekiss, Empoleon, Heatran, Kakuna, Seedot, Ledian and Rotom!

Source: Anime News Network Encyclopedia