Different Pokémon require different items and methods to evolve in Pokémon Brilliant Diamond & Shining Pearl, and several Pokémon will only evolve once trainers find a Dusk Stone. While BDSP includes the Dusk Stone locations that were in the original games, more methods can be used to acquire Dusk Stones in the remakes that weren't featured in the originals. For example, access to the Grand Underground in Pokémon BDSP allows players to find an additional Dusk Stone.
The Dusk Stone was one
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