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But I do beleive when you get into Kanto I think it's either every Monday or every Friday (I'd have to play my Silver version again when I get a chance...)
You go to this one section of Mt. Moon (The entrance closest to Cerulean City.There should be some kinda house near by it.) But I think you should see some Clefairy jumping around a rock and fleeing afterwards. I think that rock contains a Moon stone.
Forgive if I fail. I'm just recalling what I did from memory.
Sorry, but this is not the place for inquiries of that matter(Hacks). You can contact the hack creator privately or depend on other sources outside the forum (FAQ/Shiny gold thread).