It would be the same as PKMN Pearl & PKMN Platinum. In Diamond, you can get it in The Underground & Route 213. In Platinum, you can find it in the Solaceon Ruins. You must have a Poliwhirl, a Shellder, a Staryu, an Eevee, or a Lombre seeing you want a Water Stone.
In Diamond, you can obtain a Water Stone in the underground in Sunyshore City.
Go dig underground and with luck a Water Stone appears
go underground and keep digging till u find a water stone or a fire stone
Thunder stone =Jolteon Water stone = Vaporeon.Fire stone = Flareon.
A Water Stone evolves a Poliwhirl, Shellder, Staryu, Eevee, and Lombre.
Diamonds do not float.
what do you mean
evee
to evolve certain Pokemon
Did underground and maybe you'll get lucky!
you can find one while mining
No stone compares to a diamond.