Giratina is a stage-less pokemon,genderless pokemon and does not have evolutions. Giratina is Dark/Dragon Legendary Pokemon.
Giratina's Altered Forme is a giant, dragon-like Pokémon, with an appearance similar to that of a large sauropod. It has 6 legs, gold protrusions that look like external ribs, and golden horns on its head. Its neck has five red stripes and 4 black stripes. On its back, it has a black stripe pattern that extends to its legs. It has black wings with three red thorn-like appendages called Girasols (a rare type of opal) coming out of them. Giratina's Origin Forme is more serpentine (like an amphiptere) than its Altered Forme. Its wings are now shaped like tentacles with the red thorn-like appendages sticking out at the end. Its mouth is now behind the two appendages in front of its face. They open when Giratina roars or etc. The horns on its head are still the same. Giratina in Origin Forme has five rows of golden spikes protruding out of the torso and near the tail. Five gray and red stripes are partially overlapped by these spikes.