While it is similar to other legendary Pokémon in Pokémon Diamond and Pearl, including its post-National Pokédex appearance and lack of relation to the games' overall plot, it was revealed in early February 2008 to have an alternate form known as the Origin Forme, in addition to the form it takes in Diamond and Pearl, the Altered Forme. It is in this new form that Giratina took its place as version mascot of Pokémon Platinum, the third version of Generation IV's Sinnoh-based games.
As first revealed by Japan's CoroCoro Magazine, Giratina has two forms. The first (Altered Forme) is the form that appeared in Pokémon Diamond and Pearl. In this form, Giratina has a large, gray, centipede-like body with six short, thick legs. Its legs have gold claws and gold bands on them. It has a tail and a thick black stripe running vertically along the front of its body. There is a series of red horizontal stripes running across the large black one. Three gold half-rings circle the back half of Giratina's neck at the same points that three of the red stripes are at on its front, resembling a ribcage. On its back are two large, black wings that are decorated with red, conical objects that also could be claws. The wings seem oddly out of place, due to the fact that Giratina seems far too heavy to fly effectively. The wings also seem to be ghostly, as they can change shape as if they were made of a liquid or gas. Giratina's head and eyes resemble those of Dialga and Palkia, causing many to theorize that it is related to the two. This assumption is confirmed in Pokémon Platinum.
Giratina appears after Darkrai is defeated by Light and Danny Phantom. Giratina, believing they are evil, attacks them. Eventually, a Portal appears and Shalos come out. Giratina, Darkrai, Light and Danny join forces and escape through the Portal. After that, they meet with the heroes and the legendaries and Danny joins the Heroes.