It is not known to evolve into or from any other Pokémon. Palkia is the version mascot of Pokémon Pearl, appearing on the boxart. Along with Dialga and Giratina, it is a member of the Creation trio of Sinnoh, representing time.
Palkia looks dinosaur-like, similar to Dialga, though it seems to be based on a theropod, the bipedal carnivorous dinosaurs. Palkia’s body is mainly a shade of light purple, although it has stripes and markings of a darker shade and a grayish-colored arm underside and waist. It has round purple-striped plates on its shoulder area, where two pink pearls lie encrusted with a gray rim encircling them and fins in their back. Palkia’s arms have somewhat gauntlet-like extended formations and a purple band of coloration at the wrist. Palkia has a long neck, a pointed white crest on the top of its head that extends to its wings, two strong horn-like tusks on the sides of its jaw, and a powerful tail.