What I would do is sell it for money then use that money to buy master balls ( .Y .)
you don't. you only get the dark stone
To get the dark stone you need to go to the relic castle to find that it is not there and the you receive a call from professor juniper to go to the museum in nacrene city and you will receive it from the gym leader
hard stone can be found at dark cave
dark wed
you find a secret place you find a legenary pokemon that holds this stone defeat it you get it.
You can only find a Magma Stone in Pokemon Black 2, White 2, Pokemon Diamond, Pearl, and Platinum. It is not available in Pokemon Black and White.
You don't. There's no such thing as a ground stone
In Pokemon white after you get the dark stone you go to the Pokemon league and battle the elite four. Afterwards you go to the champion and Z will be there, a giant castle will appear and you will have to go inside and search for Z. Once you find him your dark stone will start to shine and Zekrom will appear, you then have to battle Zekrom and catch it. Afterwards you can choose to put Zekrom in your party and then you will battle Z.
You find it in the chargestone cave
route 6
find a sun stone.
The Black Stone is on display at Nacrene City's museum.