There are certain types of people down there, and they all look like hikers. Check this out to find out what kind and where they are! http://www.psypokes.com/dp/undergroundmap.php they are the colored squares.
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You can get them from veilstone city department store. you can also get them underground when you trade in dug up items.
Sadly, no. You can get stones in the underground. Just keep digging.
trade from diamond trade from diamond
You can't. You have to trade from someone from Pokemon Diamond to get it. If you can trade from Diamond...
Yes.