This move effect may be in need of research. Reason:Does it check the Pokémon's species before or after using Transform (in each generation)? You can discuss this on the talk page.
In Pokémon Platinum and HeartGold and SoulSilver, only Giratina can hold a Griseous Orb, and Pokémon holding Griseous Orb cannot be traded. From Generation V onward, these restrictions no longer apply.