first you have to go underground. they are sometimes pretty rare. when you get underground, use the touch screen to look for stuff(some in walls some in ground). the top screen should be showing gold dots on the underground map. go there.
Not only underground. Go to where you can find clefairys. They are mostly in caves don't know which. Some and most likely of clefairys are holding moonstones to evolve itself.
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you use the moonstone
You can get it from evolving it atrually or with a very hard to find moonstone I think, or you can also find them in Mt coronet hope this helps a lot! Pokemon diamond version for sure!
Mew cannot be caught in the wild in Pokemon Diamond and Pearl. You need the action replay code.
You can find Aron only in Diamond.
No.Only in diamond.