you find them in mount moon but you might be able to buy them in celadon department store, but moon stones only evolve certain types of Pokemon if you want to evolve a fire,grass,water, and electric then use the stones in the department store.
hope this helps!
find them
in caves, people, pokemon, the syour.
There are 2 moonstones that are findable in LeafGreen. One is found in Mt. Moon, while the other is found in the Rocket hideout. Additional moon stones can be found on wild clefairy.
Clefairy does not evolve through levelling up, you must obtain a moonstone and use it on it. (There are three moonstones in the game)
you can find a few in mt.moon. just search throughly. -RR14
Piplup does not exist in Pokemon LeafGreen or FireRed.
No, you cannot find cyndaquil in LeafGreen.
you should go to gamestop
LeafGreen version does not have Growlithe.
In the grass...
You cannot catch houndour in Pokemon leafgreen either get one from Pokemon emerald or Pokemon colosseum.
there is no such Pokemon