If held by a Pokemon it will increase the power of rock type moves such as rock slide or rock throw. Giving it to a rock type Pokemon is highly suggested.
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No Pokemon evolves by hard stone. Hard stone just increases the power of rock type moves.
You can get the Hard Stone from Arthur, who is located on Route 36 on Thursdays.
A hard stone is a hold item, to give to a Pokemon to make their rock (or ground)type moves stronger. It doesn't make any Pokemon evolve.
In Route 36 from Arthur on Thursday.
An item to be held by a Pokémon. It is an unbreakable stone that ups the power of Rock-type moves.