u dont need one. all pokemon that requires a special condition to evolve WILL evolve even without trading or using stones. except "eevee" ( with eevee moon stone will give u glaceon while leaf stone gives u leafeon ) hope it helps
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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.
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.
There is a Dusk Stone in Team Galactic's HQ, and in an area of Victory Road only accessible after defeating the Elite Four. They can also be found with the Pickup ability.