There are several evolutionary items you’ll need to find to evolve your Pokémon. The Dusk Stone is one of many evolution items. If you want to make use of the beastly Honchkrow or the special-attacking powerhouse Mismagius, you need to search for a Dusk Stone. This walkthrough will show you where to look for a Dawn Stone in Pokémon Brilliant Diamond and Shining Pearl. There are two Dusk Stones to find.
#1 Galactic Warehouse
First, defeat Jupiter at Lake Acuity to obtain the warehouse storage Key. Go to the Galactic Warehouse area on the left side of Veilstone City. Dusk Stone can be found just inside the warehouse.
#2 Victory Road
After the Elite Four, you can enter a new area on Victory Road. The Dusk Stone can be found in the final room inside of Victory Road area. Once inside, climb all the way to the top on the left and push aside the rocks to reach the Dusk Stone.
#3 Bogsunk Cavern
The third location where you can find Dusk Stone is Bogsunk Cavern inside Grand Underground.