cloyster doesn't evolve into any Pokemon. You can evolve it from Shellder but with a water stone rather than leveling up.
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Get a shellder then use a water stone on it and it will evolve into a cloyster.
Shellder doesn't evolve by level. You have to use a Water Stone and it will evolve into a Cloyster also the moves it learns when it evolves are aurora beam toxic spikes protect and supersonic hope i helped :) lol
For Cloyster its basic
Shelder evolves into Cloyster with a Water Stone hehehe;)
Poliwhirl → Poliwrath, Shellder → Cloyster, Staryu → Starmie and Eevee → Vaporeon