Fuck Platinum for ruining Giratina's lore. It made it into a personification of antinatter. In Diamond and Pearl Giratina is more like a pokemon version of Hades or the devil. It appears in cemeteries and the cave where it lives is inhabitated by many ghosts. The pokedex entry also says that it lives in a world on the reverse sides of ours, but it seemed to meant the underworld instead of the soulless world made of antimatter called the distortion world.