You can get two in Mt. Moon. The first one can be found as a Pokeball just after you battle a hiker. The second one is invisible. You need to search by the rocks just before you battle a super nerd which lets you obtain a helix/dome fossil upon defeating him.
To note: Dome Fossil gives you Kaboto, while Helix Fossil gives you Omanyte.
The third one can be obtain by doing a quest on Two Island and Three Island.
You also get one after you fought Giovanni for the second time.
Answer
You might also want to catch a wild Clefairy which happens to have 1 as a held item.
Your mother might buy you one if you leave your money with her, and you can sometimes get one for 2500 points at the Pokeathalon, and you can sometimes win one from the Bug Catching Contest, at the Ruins of Alph, in the Tohjo Falls, and at Mt. Moon
you can either trade points for it at the poeathlon dome, or go to the Mt. Moon Square at night. The Clefairy will not always be there. Remember, the moon stone is also not always at the poke dome.
you can find it underground or catch a cleffa or clefairy they CAN be holding a moon stone
It can be found in the Ruins of Alph in the Johto region and in the Kanto region: Mt. Moon (Monday Night) or Tohjo Falls.
Its easy!
Fly to the moon with a rocket,
pick a stone!
And fly back to the earth!
pokeathalon prize [monday,wednesday]or ruins of alph lower right entrance 2
Wait for your mom in the game to say she sent you a package and it might be a moon stone
At Mt. Moon Square, on Monday nights (after 8 pm) there are Clefairy dancing, and they will leave behind a Moon Stone. You can also get one at the Pokeathlon Dome on certain days
you can not buy a moonstone in any Pokemon game but you can find them somewhere
duck you
A Moonstone can be found in Meteor Falls. According to Serebii, it is the only location to find a Moonstone in Pokemon Emerald.
Nidorino, Nidorina, Jigglypuff, Clefairy, Skitty.
nothing,i think
you can find it in waterfall cave in kanto
get a moonstone. get a Pokemon that can evolve with a moonstone. go to your bag. choose the moonstone. choose use. select your Pokemon. Congrats on your new Pokemon
Clefairy doesn't evolve by level, you'll have to use a moonstone on her.
What Pokemon need a moonstone?Here is the list:ClefairyJigglypuffNidorinaNidorinoSkitty
Moonstone makes pokemon evolve.
Monoclinic
Monoclinic
You can get a Moonstone on Pokemon White after you defeat Team Plasma in Pinwheel Forest and talk to Lenora. She will give you a Moonstone.
you can not buy a moonstone in any Pokemon game but you can find them somewhere
it's rare to find a moonstone
ClefairyNidorinaNidorino
Moonstone evolves certain Pokemon use it to evolve these Pokemon: Clefairy, jigglypuff, nidorina, nidorino, skitty.