Giratina is a large gray draconic Pokémon with three gold half-rings on each side of its long neck. Its head has a gold crown-like object surrounding it with two large horns pointing sideways. A thick black stripe runs vertically along its front with five red horizontal stripes. In its Altered Forme, it has two large black ghostly wings with three red tips on each that can resemble claws. These wings can change shape as if made of a liquid or gas. Its six legs are thick and have golden claws. Two golden half-circles similar to those on its neck are on each side of each leg, resembling shackles. It has a tail with two band-like markings. Giratina remains in its Altered Forme when outside of its home dimension. It generally moves by levitating itself in the air, as opposed to walking on its six legs.

Giratina is a highly aggressive and territorial Pokémon that is protective of its home. Legends claim that Giratina lives in a world on the reverse side of the Pokémon world, and has also been reported to appear in ancient cemeteries. As seen in Pokémon Legends: Arceus, Giratina has the power to tear a hole in reality, creating a space-time distortion along with driving both and berserk. The rift is also capable of driving Noble Pokémon into berserk Lord/Lady States. Giratina is said to be equal in strength to Dialga and Palkia. Giratina was banished by for its violent behavior, though in the anime, it is shown to possess a gentler disposition when in the presence of humans. Giratina at one point carried a large grudge against its creator Arceus and was willing to stand against it with the help of a human named Volo, but after being beaten by a human from another time and fleeing, it would start to change its ways and protect the universe from threats such as Cyrus. Due to its typically violent nature, the history of Giratina was covered up due to ancient people fearing it. Giratina is said to have observed the real world silently while in its home dimension. The anime reveals Giratina can also open portals through any reflective surface. Giratina's role is to keep both worlds in balance. Giratina also had many different titles to it; banished Pokémon, Arceus's shadow, the Pokémon of Shadows, and being on the other side of our world.

Forms
Giratina can change between its Altered Forme and Origin Forme.

In its Origin Forme, it takes on a serpentine look. Its legs are reduced to golden-tipped spikes, and four additional golden spikes appear near the edge of its tail. While in Origin Forme, the six gold half-rings can grip objects. The back points of each half-ring have a black ghostly tendril with a red spike at its tip. The horns on its head are now facing the back. The sides of the golden "crown" cover its mouth and separate vertically like an insect's mandible when it opens its mouth. The black vertical stripe is broken into pieces and runs down its body. Giratina can only be in its Origin Forme when in its home, the Distortion World, or when holding either a Griseous Orb or Griseous Core. Giratina can also maintain its Origin Forme in the real world without items should it get a sufficient amount of power, enough to potentially be equal to Arceus. Giratina is at its full power when in the Origin Forme, and is always levitated in this state.

The Origin Forme of Giratina is said to be Giratina's true form, capable of traveling through and controlling dimensions besides those of time and space. When in its Origin Forme, it can pass through dimensions at will, however, it will turn back to its Altered Forme due to the gravity change from the Distortion World. Giratina has the power to turn itself into a shadow and to merge the Distortion World with the Pokémon world, as seen during the events of Spear Pillar. However, this has the dangerous side effect of distorting it to the risk of being destroyed.

(Source: Bulbapedia)

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