Sunstones are hard to find items.
Just keep digging, digging, digging.
Source: http://www.psypokes.com/dp/undergroundrarity.php
Also, if you bury spheres in an area, there will be more stuff in the walls near the spheres.
Anywhere, but it's not in Pearl version.
underground
underground in pearl...
No.
Moonstones can be found by digging in the Underground with your Explorer Kit. It is one of the treasures you can find by digging into areas of the wall where you see sparkles when you press the touch screen. It is very rare in Pearl, but not by any means impossible to find.
Find a fossil underground. I did.
You can find them underground
You can find kabuto underground if you dig
You cannot get a waterstone from Diamond . You can trade one into your game card from a previous version of pokemon , or meet someone in the underground maze that has one . You can find a waterstone in the underground maze in Pearl . Though there is a 2% chance that a stone from Pearl can be found in Diamond .
In the underground.
underground
underground of Sinnoh