Where do you get a Dusk Stone in Black?

Question

So, I need to evolve my lanpent...that was quite a long time ago. I never got the chance to find one because I played when it was just released, and nobody knew where to get one. I still don't know how to get a Dusk Stone.

Please Help Me. Thanks in advance

Answer 1

>Route 10, Mistralton Cave, Wellspring Cave (Dustcloud), Chargestone Cave (Dustcloud), Mistralton Cave (Dustcloud), Twist Mountain (Dustcloud), Challenger's Cave (Dustcloud), Victory Road (Dustcloud), Giant Chasm (Dustcloud)

Hope I helped. :)
Source

Answer 2

Non-repeatable
- Route 10 (from the Vetern near the northern bridge)
- Mistralton Cave (Northeast corner of 3F)

Repeatable
- Dust clouds
- Black City ($10,000 from Herman)

Dusk Stone (Bulbapedia)