How do you obtain a moon stone on Pokemon leaf green?

Answer 1

There is one in Mt Moon and one in the Team Rocket Base in Celadon City's Game Corner

Are those the only ones you can get?

EternalAlercon:

You can easily find five (yes five) moon stones. There is six in total. (I remember I had Nidoking, Nidoqueen, Wigglytuff and Clefable in my 'moon' team ^.^). 1.Mt. Moon (First floor, upper left corner.)2.Mt. Moon (Yes, there is another one at the end. Between place where you fight one member of Team Rocket and Super Nerd -where you have to chose one of two fossils- There is a rock in bottem right corner)3.Team Rocket Base (Don't ask me. It isn't hidden, so don't joke you haven't found it. ^.~)4.Mansion on Cinnibar Island (Go left and up, where is group of rocks. Check rocks. I think third from the bottom contains moon stone, but you must check it yourself ;P)5.Two Island (After you rescue Lostelle from Hypno, and talk to her father, he will give you moon stone)

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!6. There is only 5% chance that wild Clefairy will hold it. So you can try catching it, but this is really rare pokemon, so I think you have 1% chance to get moonstone from them.Good luck.