It doesn't exist in that game.
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you can find a dusk stone in the ruins of alpha
you can find dusk stone's in swirling dust in cave's. (random stones/gems and the mole pokemon) and a veteran, south to a hiker, on route 10 will give you a dusk stone.
first of all you dont get a dusk stone in firered secondly you must mean the moon stone
victory road
In Pokemon Diamond, there are two locations where a Dusk Stone can be found. The first is in the Galactic Warehouse, and the second is Victory Road.