If you are playing Diamond, you can find the adamant orb at the spear pillar. (where you found Dialga) And if you're playing Pearl, you can also find the lustrous orb at the spear pillar. (where you found Palkia)
But, you can't find the lustrous orb in Diamond. And you can't find the adamant orb in Pearl.
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Once you first exit Mt. Coronet and arrive in a snowy area (like you were going to go to spear pillar), go left (the only way to go at this point :) ) and go north (not up the steps) when the path turns. Head all the way north and rock climb up. Instead of going left (towards Spear Pillar), reenter Mt Coronet on the right. Go up the waterfall and you should see the orbs.
You cant get the adamant and lustrous orb after you sell it
After you beat the elite 4, go to celestic town and talk to the elder. Bring both the adamant and lustrous orbs to spear pillar.Plz send feedback!
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
In black and white, if you ever get the legendary Pokemon Palkia, Dialga, and Giratina, you can give them the orbs, and they'll be stronger.
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.