You wil have to trade with FireRed or XD.
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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.
Shellder can't be found in the wild in Pokemon leaf green, you would have to trade it from fire red.
No, you have to trade it from FireRed or Pokémon XD: Gale of Darkness
Shellder evolves using the Water Stone. There is no level that it specifically has to be on in order to evolve.
Use a good rod in seafoam islands.