Well. You can do the bug-catching contest. come in first and it is one of the first-place prizes.
you need to go to the pokeathlon dome and earn points by doing the events. then you have to buy the water sone from the store in the pokeathlon dome i think it is 3000 points
it evolves poliwhirl to poliwrath, eevee to vaporeon, staryu to starmie, lombre to ludicolo, and shellder to cloyster. hope that helped :)
Exchange Blue Shard with the Waterstone. You'll find waterstone in Abandoned Ship, too.
Poke'athalon
only vapreon
lombre and staryu.
I know poliwhirl will evolve to poliwrath and that shelder will evole to cloyster with the waterstone
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.
Its evolve to Vaporeon from eevee
buy it in celdon city
You can buy them at Celedon's Department Store.