Griseous Orb

Held by giratina : Holder's dragon and ghost moves have 1.2× their base power. Holder is in Origin Forme. This item cannot be held by any Pokémon but Giratina. When you enter the Union Room or connect to Wi-Fi, this item returns to your bag.

“A glowing orb to be held by GIRATINA. It boosts the power of Dragon- and Ghost-type moves.”