Yes, enter Turnback Cave after you beat Cynthia. Go to the portal; it will not be there. Giratina will be standing there.
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You need to catch Giratina or beat Giratina after that go to Lake Verity. You need HM Surf...
its been confirmed you can catch it in Pokemon platinum pearl and diamond
Yes, but if you want to catch giratina later you can go to turn back cave.
In turn back cave
catch or kill giratina the you'll go to sendoff spring haunter is somewhere there. NOTE if you dont believe me kill or catch giratina go in the portal where giratina was then look on the map!