Where do you find a moonstone in the jhoto region?

In the Johto region of Pokémon, a Moonstone can typically be found in the following locations: it can be obtained by breaking rocks in the Ruins of Alph or found in the Goldenrod Department Store's basement. Additionally, it may be found in the Celadon Department Store in Kanto, which is easily accessible from Johto. Players can also receive Moonstones as gifts from certain NPCs or through in-game events.