Pokemon Brilliant Diamond & Shining Pearl is a remake of 2006 NDS and is a role-playing game developed by ILCA. There are various evolution stones that are used to evolve certain Pokemon. Below you will find the location of the dusk stone, oval stone, and which pokemon to evolve using these stones.
Pokemon Brilliant Diamond & Shining Pearl Where To Find Dusk Stone
To find the dusk stone you need to continue with the game story. Once you defeat seven gym leaders and have visited all the lakes you will get a quest to visit the team Galactic warehouse. After that go to Veilstone City and visit the Galactic headquarters at the top side. There you will find a member of team galactic named Grunt.
Interact with him and then while leaving he will give you the storage key. Now you need to visit the galactic warehouse and use the storage key to open the metal door inside. There near the computer, you will find the dusk stone. To reach the galactic warehouse you need to take a right from the pokemon center, then left, and finally right. Dusk stone is used to evolve:
Pokemon Brilliant Diamond & Shining Pearl Where To Find Oval Stone
While going towards Veilstone city from Hearthome city, near the signboard route 209 you will find the lost tower on the right side. On the 1st floor of that tower, you will find the Oval stone. On the first floor, there will be only one NPC with whom you need to battle and in front of him you will find the stone
The oval stone is used to evolve Happiny into Chansey. For this to happen you need to give the oval stone to Happiny to hold and level up it during the daytime. Once it levels up, the evolution will take place consuming the oval stone.