Exchange Blue Shard with the Waterstone. You'll find waterstone in Abandoned Ship, too.
For which game? Pokemon Red Pokemon Blue Pokemon Yellow Pokemon Gold Pokemon Silver Pokemon Crystal Pokemon Sapphire Pokemon Ruby Pokemon FireRed Pokemon LeafGreen Pokemon Emerald Pokemon Diamond Pokemon Pearl
Its evolve to Vaporeon from eevee
its not an emerald its RAYQUAZA the main legendary Pokemon in Pokemon emerald.
You can get one in Solaceon Ruins with the dowsing machine app on the poketech.
Exchange Blue Shard with the Waterstone. You'll find waterstone in Abandoned Ship, too.
For which game? Pokemon Red Pokemon Blue Pokemon Yellow Pokemon Gold Pokemon Silver Pokemon Crystal Pokemon Sapphire Pokemon Ruby Pokemon FireRed Pokemon LeafGreen Pokemon Emerald Pokemon Diamond Pokemon Pearl
Staryu and Lombre are the only ones available in emerald to my recollection.
Poke'athalon
only vapreon
I know poliwhirl will evolve to poliwrath and that shelder will evole to cloyster with the waterstone
lombre and staryu.
You can buy one with Athlete Points at the Pokeathlon Store on some days, or you can get a Waterstone from Bill's grandfather after you show him a certain Pokemon.
Dig it out in the underground.
You Need A Waterstone.
buy it in celdon city
Its evolve to Vaporeon from eevee