Editing Dialga

Dialga originally appeared in Sinnoh-based myths as an ancient deity with the ability to control time. It is said that time began moving when it was born, and additionally that time flows as its heart beats. Dialga is also capable of traveling at will between different time periods.

Dialga, [[Palkia]] and [[Giratina]] form a trinity, and it is shown that all three of them are in fact descended from [[Arceus]], who can give birth to any of them in egg form (but only under special conditions, as shown in ''HeartGold''/''SoulSilver''). Dialga and/or Palkia can be summoned by using the Red Chain formed by [[Azelf]], [[Uxie]] and [[Mesprit]], which is exactly what [[Cyrus (Pokemon)|Cyrus]] attempts in ''Diamond'' and ''Platinum''. However, the plan goes awry in both versions due to the intervention of the three lake Pokémon in ''Diamond'' or Giratina in ''Platinum''.

A dark form of Dialga known as Primal Dialga appears as the final boss of ''[[Pokémon Mystery Dungeon: Explorers of Time and Darkness]]''. The collapse of the Temporal Tower (after [[Darkrai]] stole the tower's Time Gears) caused this Dialga to lose its power over time and be perverted into this form, which is motivated primarily by self-preservation and thus tries preventing the main characters from changing the past. After returning to the past, the player must battle Dialga and restore the tower, at which point Primal Dialga's future is overwritten and Dialga brings the main character back to life out of gratitude. Primal Dialga is also seen in a bonus episode of ''[[Pokémon Mystery Dungeon: Explorers of Sky]]''.

In ''[[Pokémon Ranger: Shadows of Almia]]'', Dialga appears at Almia Castle as a bonus boss during one of the extra missions. There it nurses its wounds from a recent battle with Palkia, causing a time distortion, and it will also use Roar of Time to send the main character and Wendy back in time to before the game's beginning. In ''[[Pokémon Rumble]]'', it was unlocked through a ticket after releasing [[Lucario]], [[Bastidon]], [[Magnezone]], [[Dragonite]] and [[Garchomp]]. Dialga was also featured in an optional Ranger Net mission of ''[[Pokémon Ranger: Guardian Signs]]'', where the player must catch Dialga, Palkia and Giratina at the Sky Fortress in order to meet Arceus.

*Dialga has been featured in the tenth, eleventh and twelfth Pokémon movies. In the tenth movie it is engaged in a battle with Palkia in another dimension which creates the conflict of the movie. In the next movie it faces off with Giratina, which was enraged by the damage that the previous movie's battle had caused to the Reverse-World. In the latter movie it helps Ash and his friends against Arceus and later sends them back in time to prevent Arceus from being betrayed. Dialga also appeared during the Sinnoh series with Palkia at the climax of a three-part episode where Cyrus summoned them with the Red Chain and had them create a portal to a new world. After the Red Chains were destroyed, the portal dissipated with Cyrus having passed through it, and although they were free, Dialga and Palkia continued to rampage until they were calmed by Ash's group working with the lake trio. Uxie, Mesprit and Azelf then sent them back where they belonged through portals.

*In the ''Pokémon Adventures'' manga, Dialga and Palkia were featured in the climax of the ''Diamond''/''Pearl'' arc when Cyrus summoned them at the Spear Pillar and made them fight each other. This battle caused various distortions of the space-time continuum that threatened to destroy everything, and the battle continued even after one of the Red Chains were shattered. Diamond had [[Regigigas]] attack them for a while, and ultimately he and Pearl ended the battle by shattering the last Red Chain, at which point Dialga and Palkia departed.

*Its name is derived from "diamond", reflecting the version it originally represented.