Palkia is a light purple theropod-like Pokémon with stripes and markings of a darker shade and gray underarms 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 extended formations resembling gauntlets and a purple band around each 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. It has faint cracks along its legs and tail. As seen in Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness, Palkia travels by creating a large yellow sphere from its two pearls, then using it to fly very fast.
Palkia has the ability to warp space, though it was said to create alternate realities as well. Palkia lives in a different dimension, making its behavior nearly impossible to study. However, Palkia has been seen in violent conflicts with its counterpart, Dialga. It has been known to be very protective of its home as well. Palkia is the only known Pokémon that can learn Spacial Rend.