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The Adamant Orb and Lustrous Orb are found in a cave atop a waterfall in Mount Coronet. The waterfall is the same one that you catch Dratini at. This chamber is right before the last snow before the top of Coronet.
Walk through mount coronet
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
There is no other place to get it besides Mount. Coronet. Sorry
in mount coronet