Dialga is a Dual Type Steel Dragon Legendary. It is not known to evolve into or from any others. Along with Palkia and Giratina, it is a member of the creation trio of Sinnoh, respresenting time.
Standing 17 feet 9 inches tall and weighing 1505.8 pounds, it can warp time by either speeding it up, slowing it down or stopping it altogether. As Dialga primarily resides in a different dimension, its behavior is nearly impossible to study. It has been shown to be very protective of its home, and also tends to have violent conflicts with its main counterpart, Palkia. But sometimes they restore the forgotten centuries and save the future. Being the only known Pokemon that can learn the Roar Of Time, Dialga can even be used (when captured) to end time forever!