NOthing. it doesnt work. Here are the evolutions.
Flareon: firestone
Jolteon:thunderstone
Vaporeon:Waterstone
Espeon:Max happiness in day
Umpreon:Max happiness at night
Leafeon:Lv up at moss rock
Glaceon:Lv up at ice rock
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umbreon
You use a water stone on your Eevee.
The Pokemon that can use oval stone in Pokemon platinum is Happiny. It is the pre evolve form of chansey. Mostly every chansy you catch have a oval stone.
Eevee doesn't evolve into Umbreon with a stone. Eevee evolves into Umbreon when it is levelled up with high happiness during the night.
You cant make a eevee using stones .... But you can use stones on Every to Make your Eevee Evolve .... Eevee + Thunderstone = Jolteon Eevee + Waterstone = Vaporeon Eevee + Firestone = Flareon Eevee + Happiness + Daytime = Espeon Eevee + Happiness + Night time = Umbreon Eevee + Stone in Enterna Forest = Leafeon Eevee + Stone near Snowpoint City = Glaceon You cant make a eevee using stones .... But you can use stones on Every to Make your Eevee Evolve .... Eevee + Thunderstone = Jolteon Eevee + Waterstone = Vaporeon Eevee + Firestone = Flareon Eevee + Happiness + Daytime = Espeon Eevee + Happiness + Night time = Umbreon Eevee + Stone in Enterna Forest = Leafeon Eevee + Stone near Snowpoint City = Glaceon