You can get water stones by getting a blue shards.to get the blue shards, you have to get the HM Dive. have to beat the gym leaders in moss-deep to use Dive .You only can use Dive at places on the ocean that look like they have a deep areas.Dark-blue
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you can use a water stone on lombre
On the abandoned ship.
There is no dawn stone in emerald!!!!
The Pokemon that evolve using a water stone: Eevee Starmie Lombre Poliwhirl, too...
For staryu to evolve you have to use a water stone