There is no such thing as a dark stone. But if you're referring to the dusk stone, then Murkrow will evolve into Honchkrow in Pokemon Diamond. If a Misdreavous is traded over from Pearl or Platinum, it will evolve into Mismagius with the dusk stone.
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The Japanese translation for dark stone in the American versions of the game was dusk stone. The dusk stone cannot be found in games prior to Pokemon Diamond, Pearl, and Platinum.
a dusk stone evolves dark types sun stone evolves grass types and moon stones evolve normal types
You can not get dark Pokemon on Pokemon diamond and pearl
You can evolve Lampent with a Dark Stone.I evolved my Litwick into Lampent and Lampent into Chacdelure.
A fire stone,water stone,ice stone,dusk stone,leaf stone,thunder stone,and dark stone will evolve him/her.