Dialga is a dark-blue, sauropod-like Pokémon with some gray metallic portions and light blue stripes. It has a chest plate on its torso, which has a deep blue diamond-like crystal embedded in the center. Dialga has a fin-like structure on its back, three spines on the back of its neck, and a crest on its head, resembling a dinosaur. The crest somewhat resembles the shape of a sundial's rod. It also has two structures on the sides of its head that extend outward and resemble horns and fangs. It has three claws on each foot, of the same metallic look as its chest plate. Faint cracks exist across its body. The fin-like structure on its back is shaped radiating outwards and can be used to focus the flow of time, as seen in Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness and Pokémon Mystery Dungeon: Explorers of Sky. Rather than walking on all fours, Dialga usually travels by levitation.

Dialga has the power to control time; it can warp time by either speeding it up, slowing it down, reversing it, or stopping it altogether; it can also travel through time to visit the past, present, and future. It also has the power to destroy and create time itself. As shown in the anime, Dialga's temporal powers possess the ability to devolve anything or anyone against their will: Pokémon, humans, and plants. It can even reverse these devolution effects. It is said that time started moving when Dialga was born and will continue flowing as long as Dialga's heart beats.

Dialga has the power to create a new universe by itself or with . As Dialga primarily resides in a different dimension, its behavior is nearly impossible to study. In the dimension where Origin Forme Dialga lives in, time is said to be constantly moving in different directions and speeds. It has been shown to be very protective of its home. It also tends to have violent conflicts with its counterpart Palkia.

Dialga was revered as a deity in Sinnoh myths; in the past, it was worshipped by the Diamond Clan, who referred to it as "almighty Sinnoh". Dialga is capable of speaking through telepathy, as seen when it communicates through the leader of the Diamond Clan, Adaman. Dialga and Palkia can control and spread the space-time distortions caused by , which create alpha Pokémon and cause Noble Pokémon to go berserk.

Forms
Dialga can change between its standard form and its Origin Forme.

Said to be the Pokémon's true form, Dialga's Origin Forme is drastically different from the usual sauropod-like look of its other forme, being a hybrid between it, a dragon, and a centaur, while also resembling its creator, . The back legs of Dialga become unguligrade in shape and have pointed tips instead of feet. The front legs are noticeably larger, with three distinct rhomboid claws on the underside. Further up, Dialga's knees have rectangular, long, and thin protrusions. Its chest plate is gone; however, it has a similar polygonal shape in its place. On Dialga's neck is a large shape jutting out towards the front, along with two pairs of protrusions on either side, the upper pair being larger and resembling panels or wings. Inside this large shape and wing-like protrusions are deep blue diamond-like crystals, embedded into diamond-shaped grooves. The three spines located on the back of the neck are longer and sharper. Dialga's head has two thin arrow-shaped horns extending towards the top and back of its head, along with longer fang-like horns connected to a plate mask covering its lower jaw, which can shift in angle to reveal the mouth. The plate mask also partly covers the arrow-shaped horns on their sides. Around Dialga's abdomen is a cross comprised of four arrow shapes attached to a small wheel, reminiscent of Arceus's cross-wheel. The fin-like plate on Dialga's posterior has a star-shaped layer on top of it. The tail is much shorter and crystal-shaped. Overall, Dialga's entire body becomes larger and nearly completely dark blue. The crest, arrow-shaped horns, knee protrusions, and abdomen cross are light blue, while the tips of Dialga's fin-like plate and feet are dark gray.

Dialga is at its full power when in the Origin Forme and is supposedly, permanently in it while in its home dimension. Dialga's transformation into its Origin Forme is triggered by a radiant light; it can also be invoked using the Adamant Crystal. Origin Forme Dialga can unleash meteors and shockwaves, while its Roar of Time technique can be charged into a stronger version of itself as seen in its boss battle in Pokémon Legends: Arceus. The crystals and light blue accents on Dialga's body glow brightly when it uses its powers.

(Source: Bulbapedia)

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