The turn back cave in Pokemon Platinum is in Seodoff Spring near veilstone city
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The "Griseous-Orb" is found in "TurnBack-Cave". It is item to be held by Giritina. It powers up ghost and dragon type moves and turns giritina into origin form(e).
Giratina can be found in Turnback Cave,He is at Lv 70.,Turnback Cave is unlocked after you obtain the National Pokedex it is also close to Pastoria City.
You'll need Pokemon Sapphire inserted into the DS and go to either Lake Verity, Lake Acuity, Lake Valor, Mt. Coronet, Spring Path, or Turnback Cave.
Follow the directions in these pictures: http://bulbapedia.bulbagarden.net/wiki/Turnback_Cave it worked for me in the diamond and pearl games and even in platinum. Good Luck ;)
Yes, enter Turnback Cave after you beat Cynthia. Go to the portal; it will not be there. Giratina will be standing there.