There are plenty of berry trees around that contain them, but you can also try to steal them from a gym leader's main pokémon (using the move Thief on, for example, Crasher Wake's Floatzel) The Galactic Leaders also have these.
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you get it from the berry master in route 123 you will find a house with berries all around it
the same place as in diamond.
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The moon stone is used in Pokemon Diamond to evolve certain Pokemon. You can find one by looking in the Underground.
You can find Aron only in Diamond.