The relic stone is in Agate village. After you get one of your Pokemon's shadow gauge blinking white, you will gain entry. Then, you beat a few more trainers, and at the end, you battle Eagun.
You can find it in the outside area or relic castle
it is in the desert near relic castle
You can't, there is no such thing.
usually,in a dungeon if you find a kelcleon shop.Or you could trade from Pokemon ex of time/darkness.
You find one in the ss libra.
They should be just in the store, every town has another stone
In Pokemon: Mystery Dungeon Explorers of Time/Darkness, Moon Stones can be found rarely in Kecleon Shops for 2000 Poke.
relic castle
In relic castle
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
Relic Castle in the desert
fossil in relic castle