Dialga is a sauropod-like Pokémon. It is mainly dark blue with some grey metallic portions, such as its chestplate, which has a diamond in the center. It also has various light blue stripes. It has a somewhat wing-like structure on its back and a crest on its head, resembling a type of dinosaur. Dialga also has two horns on top of its head, two fang-like horns around its mouth, three spines on the back of its neck, long claws, and a short tail. The wing-like structure on its back can be used to focus the flow of time, as seen in Pokémon Mystery Dungeon: Explorers of Time/Darkness/Sky