You use a water stone on your Eevee.
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Its evolve to Vaporeon from eevee
Eevee evolves into Vaporeon (the water version) with a water stone.
To make Eevee evolve into a Vaporeon, you have to expose it to a Water Stone.
Vaporeon - Evolve using Water Stone Jolteon - Evolve using a ThunderStone Flareon - Evolve using a Fire Stone Espeon - Evolve by happiness between 4am and 7:59pm Umbreon - Evolve by happiness between 8pm and 3:59pm Leafeon - Trade Eevee to Pokemon Pearl, Diamond, or Platinum, and level it up in Eterna forest. Glaceon - Trade Eevee to Pokemon Pearl, Diamond, or Platinum, and level it up on Route 217.
It does not evolve with a dusk stone in Pokemon Platinum