It does nothing, due to Eevee not having a Moon Stone evolution.
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you cant evolve eevee with a moon stone
Umbreon doesn't have a stone. You have to max out Eevee's happiness and level it up at night.
You can't catch Espion you must evolve it from an Eevee by using a moon stone on it to get an eevee go to Heathome city in the house next to it to get an eevee.
Leaf Stone: Exeggcute, Gloom, Weepinbel Water Stone: Staryu, Eevee, Poliwhirl Fire Stone: Vulpix, Growlithe, Eevee Moon Stone: Clefairy, Jigglypuff, Nidorina, Nidorino I'm about 90 % sure that this is all of them.
Ive hear my friends say that in Pokemon yellow you can evolve eevee in a espeon with a moon stone