Yes the only way you can get a starmie is by usinga waterstone on a staryu.
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For staryu to evolve you have to use a water stone
Poliwhirl, Shellder, Staryu, Eevee, and Lombre all evolve with a water stone.
Only the following Pokemon require a water stone to be used on them for them to evolve. Poliwhirl to Poliwrath Shellder to Cloyster Staryu to Starmie Eevee to Vaporeon Lombre to Ludicolo Panpour to Simipour
Staryu does not evolve by level. You use a water stone to make it evolve.
staryu doesn't evovle you have to use a water stone