evee
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There is no Pokemon in sinnoh that evolves by a water stone.
In Diamond, you can obtain a Water Stone in the underground in Sunyshore City.
You can evolve Eevee by giving it:A thunder stone evolves it into: JolteonA water stone evolves it into: VaporeonA fire stone evolves it into: Flareon
There is no such Pokemon item as a 'Damp Stone'. You may have gotten confused between two different items: The Damp Rock (an item found while digging in the Underground) is not an evolutionary stone. It is a hold item which boosts the number of turns in which the move Rain Dance lasts. This increases the power of Water-type moves and decreases the power of Fire-type moves for the duration of the move (which is extended with the aid of the Damp Stone). The Dawn Stone is an evolutionary stone which only evolves two Pokemon (as of Pokemon Diamond and Pearl). When used on a female Snorunt, the Pokemon evolves into a Froslass. When used on a male Kirlia, the Pokemon evolves into a Gallade. No other Pokemon can evolve from the Dawn Stone.
Eevee evolves into Vaporeon (the water version) with a water stone.