Moon Stones are used to evolve certain Pokemon, but they are not obtainable in Pokemon Black.
Here's why:
* Game-Specific Evolution Items: Each Pokemon game has its own specific set of evolution items. Some items, like the Moon Stone, are not available in every game.
* Pokemon Black's Evolution Items: In Pokemon Black, you can find other evolution items like the Sun Stone, Fire Stone, Water Stone, and more. However, the Moon Stone is not one of them.
To evolve Pokemon that need a Moon Stone, you'll need to:
* Trade: Trade with someone who has a Moon Stone from a different game.
* Use a Cheat Device: (Not recommended) Some cheat devices allow you to add items to your game, but this is against the spirit of the game and could potentially cause issues.
Keep in mind that the Moon Stone is required for the following Pokemon evolutions:
* Nidorina evolves into Nidoqueen
* Nidorino evolves into Nidoking
* Snorunt evolves into Glalie
* Kirlia evolves into Gardevoir
Hope this helps!