Dusk Stone
A Dusk Stone is a type of evolutionary stone used to evolve certain species of Pokémon:
It can be obtained by crafting it, as a drop from certain wild Pokémon, or as a tier 2 special drop. The shards used to craft Dusk Stones can be obtained by mining DawnDusk ore at dusk or by using Forage on stone-based blocks with a Dark-type Pokémon.