Only the following Pokemon require a water stone to be used on them for them to evolve.
Poliwhirl to Poliwrath
Shellder to Cloyster
Staryu to Starmie
Eevee to Vaporeon
Lombre to Ludicolo
Panpour to Simipour
evee
A Water Stone evolves a Poliwhirl, Shellder, Staryu, Eevee, and Lombre.
As of Pokemon Diamond/Pearl/Platinum, the Pokemon that evolve via Water Stone are: * Poliwhirl (evolves into Poliwrath) * Shellder (evolves into Cloyster) * Staryu (evolves into Starmie) * Eevee (evolves into Vaporeon) and * Lombre (evolves into Ludicolo)
Eevee , poliwhirl, shellder, staryu and lombre Issac Lim
There is no Pokemon in sinnoh that evolves by a water stone.
well on heart gold he evolves at twenty into quagsire.
poliwhirl evolves into poliwrath with a water stone
Lotad evolves at level 14. LOTAD --lv14-->LOMBRE --water stone--> LUDICOLO
water stone
EEVEE evolves into VAPOREON by using a water stone
The only one I know of is Eevee which evolves into vaporeon.
In Diamond, you can obtain a Water Stone in the underground in Sunyshore City.