You to the place where you find giratina in diamond and pearl after you beat the game and go in the cave where you came out when you caught it, get past the 3 pillars in less than 30 rooms and there should be a portal to go back to the distortion world after the 3rd pillar and its at the end of the distortion world
PS: this is how I got mine but look on YouTube on how to get the Grisceous Orb on Platinum
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Actually you can trade Shaymin and Giratina to Diamond/Pearl from Platinum but if you do - Shaymin will revert back to its Land Forme and Giratina will revert back to its Altered Forme.
Giratina will have 2 new forms and Shaymin will have a Sky Form. There are 5 new Pokemon coming out. Since it's just a remake it probably won"t
You can get Shaymin in sky form only in Pokemon Platinum Version.
You can't change Shaymin into Sky Form in Pokemon Diamond (that includes pearl). You can only change Shaymin into Sky Form in Pokemon Platinum (that includes Heart Gold and Soul Silver). You can get the Gracidea to change Shaymin into Sky Form.
You cant