There are several evolutionary items you’ll need to find to evolve your Pokémon. The Dawn Stone is one of many evolution items. If you’re trying to add the awesome Gallade or the Froslass to your team, then you need to track down a Dawn Stone. This walkthrough will show you where to look for a Dawn Stone in Pokémon Brilliant Diamond and Shining Pearl.
The fastest way to find a Dawn Stone is to capture a Pokémon with the Pickup ability. If your Pokemon ( like Pachirisu ) has the Pickup ability and are in your party, they can pick up items for you as you travel.
#2: Mount Coronet
You can also find Dawn Stones inside Mount Coronet. Head into Mt Coronet from Route 207 which is located north of Oreburgh City. Go to the bottom of the screen, then surf on the patch of water next to the smashable rocks. On the other side, you will find a Dawn Stone.
#3: Route 225
After defeating the Elite Four, you can obtain another Dawn Stone from Route 225, which is located next to the Survival Area. After defeating the trainer guarding use Rock Climb on the northern wall at the top of the route to grab the Dawn Stone.