Can be bought in the Celadon Department store (the big mart in the upper left of Celadon City).
poliwhirl evolves into poliwrath with a water stone
eevee and staryu
The Water Stone is in the Celadon Department Store, 4th Floor
poliwhirl, evee and some others
you buy them at celedons department store.
When you give the poliwhirl a water stone
The sun stone is an item similar to the thunder stone, water stone, fire stone and leaf stone it evolves two pokemon: Gloom and Sunkern.
You go to the deperment store in Celadon city on second floor.
You must use a water stone to evolve it
Poliwhirl → Poliwrath, Shellder → Cloyster, Staryu → Starmie and Eevee → Vaporeon
Yes in fact you can get dozens if you trade with firered or leafgreen because they can buy water stones all they need to do is trade you a Pokemon holding the water stone and when you get it just take the water stone from it!
evee can evole into three things in firered and leafgreen. it can evolve into flareon if you use the fire stone, jolteon if you use the thunder stone, or vaporeon if you use the water stone.