There are 2 moon stones in MountMoon. The first one is at the upper-left corner above the Hiker with the 2 Geodudes and Onix level 10. The second one is in the area where you get a fossil. Go to the land where there are 2 fossils.
Don't go on the land, just stand in front of it. See the walkway on the right wall and go to it. There will be nothing there, but keep going until you hit the wall.
Press A and it will say: "You found a MOON STONE!"
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