Using a Water Stone on Feebas will have no effect. To evolve Feebas you need to make it hold a Prism Scale and trade it.
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You do not have to give Feebas a Water Stone to evolve it. To evolve Feebas you need to trade it while it is holding a Prism Scale.
The Pokemon that evolve using a water stone: Eevee Starmie Lombre Poliwhirl, too...
You cannot evolve Seadra using a Water Stone on it. To evolve Seadra into Kingdra you need to trade it while it is holding a Dragon Scale item.
No, you cannot evolve Squirtle with a Water Stone.
Lombre is one of the pokemon that do not evolve by level he evolves by using a water stone.