From Dialga and Palkia. They are holding it when you catch them.
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you find the adament orb in the cave near the to of mt.coronet
To get theLustrous Orb click where Palkia was standing.
There's A Room In Mt.Coronet That Has The Adamant Orb And The Lustrous Orb.
You get it in Mt coronet
You must transfer it from Pearl
on the way to Spear Pillar, there is a cave opening that you need surf and Waterfall to get to. Use surf, and then waterfall, and then go into the cavern. Inside you will find adamant orb and lustrous orb.
You cant get the adamant and lustrous orb after you sell it
The Adamant Orb can be found underwater in Route 128 on the Sealed Cavern when diving in the middle.
You find it in mt.cornet and u find it right beside the adamant orb for palkia and dialga
if you have the adamant orb press a in front of the blue cloud to battle dialga. if you have the lustrious orb press a in front of the pink cloud to battle palkia. if you have both only the blue cloud will appear. you have to finish the dialga battle then go back into the mountain then go back out to find the pink cloud
it is hidden in mt.coronet in a cave you need hidden move "waterfall" to get it though