How Get Griseous Orb On Pokemon Soul Silver/platinum?

You have to enter the Turnback Cave located in the Sendoff Spring. To enter it, you must first defeat the Elite Four and the Champion. You'll need the HM Defog to proceed further inside the cave. Every time you enter, the path to the portal leading to the Distortion World changes, but a good place to start would be to go LEFT, on the upper level. From then on, you'll have to trust your instincts. (A good idea, would be to follow the rocks. I.e. If there are rocks blocking a certain door, head to another. I.e. Follow the arrows they create.)

There will be a few rooms with pillars and a strange encryption on it. When you reach the one that says 3 9, head down into the door. The room should be darker or "mistier" than the others. There will be a level in the center with a rock with the same encryption. Also a pokeball holding a Rare Bone will be near the portal.

Once you leap into the portal, the path to the Griseous Orb is pretty linear.

You'll recognize the area where you fought Giratina. There will be a pokeball on the RIGHT, holding the Griseous Orb.

(Sorry for making it so long. XD)

You can get in SoulSilver by doing the Arceus Event. You can do it by taking a Toys R Us (TRU) Arceus and taking it to the Ruins of Alph. Walk up to the door (make sure Arceus is the first one in your party) and a guy will jump out at you. The rest happens by itself.

Go to spring bath and then go to were giritana is standing in diamond.Click a on the pokepall it will be a zinc then the distiortion world will apear enter walk around till a pokepall is spotted it's the thingy mobby orb.

What is the Griseous orb? Is it like the Lustrious Orb, but for Giratina? Like, what is it? If it is for Giratina, go back to the cave that Giratina was in, and there should be a pokeball there ------ you have to get to where he was in a certain amount of times (sorry confusing....), but you have to get to Giratina's room in a certain amount of tries - if you don't get there in that amount, there will just bean item called "Rare Bone" which you can "sell to a shop for a high price" as it says. That is what I got, so I hope you get it - good luck

that is what you wanted right? Giratina's Orb thingy?