Get a shellder then use a water stone on it and it will evolve into a cloyster.
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Blastoise is the best but gyarados and cloyster are also very strong
in leaf green you cant find ekans, arbok, oddish, gloom, vileplume, psyduck, golduck, growlithe, arcanine, shellder, cloyster, scyther, and electobuzz but you can trade them from fire red.
Yes you can trade leafgreen version Pokemon to another leafgreen version.
Wailord and cloyster
cloyster doesn't evolve into any Pokemon. You can evolve it from Shellder but with a water stone rather than leveling up.