Where do you get moon stone in pokemon sapphire?

You can't buy a moon stone, but you can get a moon stone in Meteor Falls. You can only evolve Skitty, clefairy and Jigglypuff with that stone.

Actually you can get even more, infinately, by using the move thief on multiple lunatones, which can be found in Meteor Falls, but not in Pokemon Ruby. If you don't get a moonstone right away form a wild lunatone, run away and find another. You cannot do this to find a sunstone, which are held by solrocks wich can only be found in Ruby. So if you want a bellosom and a corsola, don't trade, corsola can be fished with a super rod. in the east south ocean.