How do you get the platinum orb on platinum?

first thing you need to do is beat the elite four, then go to turn back cave and keep walking threw doorways until you see this portal with a rare bone above it. go in the portal and walk to the end of the distorotion world and you will find the platinum orb to the right. It gives girantina to transform into its origin form(has better stats then altered) PS: this item is not called the platinum orb. it is called the gresious orb( i have the English version and it was the gresious orb. people just think it is called the platinum orb because the game was called Pokemon platinum.