Shellder is a version exclusive Pokemon only found in Fire red. But, Instead of Shellder, you can get Slowpoke, if you use a good rod in the Vermillion city harbor.
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Shellder can't be found in the wild in Pokemon leaf green, you would have to trade it from fire red.
Get a shellder then use a water stone on it and it will evolve into a cloyster.
lombrea, evee, poliwhirl, shellder, and staryu. some of these can only be found in firered and leafgreen so you will need to trade. that's all I can think of.
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.
You cant find Shellder in Leaf Green. You can find Shellder in Fire Red in these locations: Route 25, Cinnabar Island, Icefall Cave Entrance, Lavender Town, One Island, Pallet Town, S.S. Anne (Fish)