Giratinas griseous orb is in the reverse world, you'll have to capture giratina and go back into the reverse world to obtain it. As for dialgas and palkias these are found in mount coronet...I'm not sure if you have to beat the elite 4 first or not...but when you encounter palkia and dialga they are at level 70 so goodluck
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at the start you go to the normal ur place where you get the life orbs and there will be a whole stock of them.
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Ok there's a waterfall right before u get out on the snow the 2nd or 3rd time i believe if u surf to it use waterfall on the waterfall and go into the cave you'll get both orbs for dialga and palkia
The Adamant and Lustrous Orbs are hidden in Mt. Coronet! You will have to use waterfall to get in the room. Link to Walkthrough: http://www.youtube.com/watch?v=KXHdutWVcuM
The Red and Blue Orbs are found at Mt.Pyre ...both the team magma and aqua bosses will have gathered there and you are able to take both the orbs..:)