Shellder evolves using the Water Stone. There is no level that it specifically has to be on in order to evolve.
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You evolve shelder with a water stone.
Shellder does not evolve by level. Use a water stone on it (bought from celadon department store) when you are ready to evolve it
cloyster doesn't evolve into any Pokemon. You can evolve it from Shellder but with a water stone rather than leveling up.
Evolve it from larvitar at level 30 to evolve it into pupitar then evolve it into tyranitar at level 55
You have to trade him