You can only acess Turnback Cave if you have the National Pokedex. So when you there's a path called Spring Road just north of Veilstone City. Go onto Spring Road and just keep going until you reach a large pond with a cave next to it. Go into the cave, and there you are.
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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.
palkia in spear pillar giratina in turnback cave gabite in victory road and gible in the cave under the cycling road with the mini jumps
The turn back cave in Pokemon Platinum is in Seodoff Spring near veilstone city
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 ;)
In Platinum, you first meet Giratina in the Distortion World. If you kill him there instead of catching him, he will reappear post-game in Turnback Cave (off of Route 214). If you caught him in the Distortion World, you’ll find a Griseous Orb in Turnback Cave where Giratina would‘ve been. He only appears post-game in Turnback Cave in Diamond and Pearl. If you kill him there, well…just make sure you save the game before battling him.