In Pokemon Platinum, the Adamant Orb is located deep inside Mt. Coronet. In order to get to it, you will need Rock Climb, Surf and Waterfall. When you get to the top of Mt. Coronet in the snowy area, use Rock Climb and head into the cave on the east. Use Surf on the water and use Waterfall on the waterfall, then head into the cave entrance. In here you will find a rock with two PokeBalls, inside one of the PokeBalls is the Adamant Orb for Dialga, in the other will be the Lustrous Orb for Palkia, and if you press the A Button on the front of the rock, you will find the Stone Plate for Arceus! Hope this helps!
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catch it in spear pillar w/ the adamant orb. Dialga appears at Level 70
In Pokemon pearlgo to mt.cornet and you saw palkia in the back of palkia the lotus orb is there P-L-A-T-I-N-U-M NOT pearl in the room with the waterfall in the middle surf and then use waterfall by the waterfall and the Adamant Orb and Lustrous Orb are in there
The Griseous Orb is only available in Pokemon Platinum.
You cant get the adamant and lustrous orb after you sell it
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