You can get one in a building where you got the tea in celadon it is the upper most bit in cleadon
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You can't leafeon doesn't exist in leafgreen.
Pokemon LeafGreen does not have a time system. This makes it impossible to do evolutions that involve time such as evolving Eevee into Espeon or Umbreon.
Eevee does not appear in the wild naturally in Pokemon Sapphire. In order to get one, you have to trade it from either FireRed or LeafGreen, where you can get one in Celadon Mansion, or from Pokemon XD, where you start with one.
Trade it to ruby,sapphire or emerald have them evolve your evee at night then give it back to leafgreen.
In ANY GAME!! If you use a moonstone, i think