Giratina is a Legendary Pokémon which can be obtained by completing the Giratina Quest in the Ancient Cave if you have hands on a Griseous Orb. Once you complete the Giratina Quest, you will be given a Spooky Manor (Map) where you can obtain Giratina's summon item, which is the Dark Orb.
A single Griseous Orb was obtainable for users during the Halloween Event 2014. After the Halloween Event ended, the orbs were made obtainable from opening Mystery Boxes, as one of the rare, legendary summon items.
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Giratina does NOT evolve.