Pocket Monsters Diamond & Pearl is the main Japanese title for the fourth Pokémon anime series, following the adventures of Ash Ketchum and Pikachu in the Sinnoh region. It introduces new companions, Pokémon from the Diamond and Pearl games, and a fresh set of gym battles and contests. The series continues the long-running anime storyline while focusing on Sinnoh’s landscapes, characters, and regional Pokémon.