Where is a dark stone on pokemon?

In Pokémon games, a Dark Stone is typically found in specific locations, such as caves or ruins. For example, in Pokémon Black and White, you can obtain the Dark Stone in the Dreamyard. It is often associated with certain events or used for evolving specific Pokémon, like transforming certain Legendary Pokémon. Always check the specific game guide for the exact location and usage details.