a piece of cheese
Cloyster can only be obtained through evolving Shellder. Shellder is a FireRed-exclusive Pokemon in Generation III.
You wil have to trade with FireRed or XD.
Shellder can be found in firered and leafgreen either you fish for one or look in seafoam islands.
I know firered can, if you seen a shellder look at it on your pokedex and check its area if it says unkown you will HAVE to trade a shellder to leafgreen from firered.
Use a good rod in seafoam islands.
You can catch shellder in Pokemon red, blue, yellow, gold, silver, crystal, FireRed, XD, diamond, and pearl.
Poliwhirl → Poliwrath, Shellder → Cloyster, Staryu → Starmie and Eevee → Vaporeon
u hau have to trade a shellder from firered and then evolve it w/ a water stone.
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.
Pallette Town with the Super Rod. (Yes, you need the Super Rod in Fire Red.)
you can't get a shellder in leafgreen, you can only get it in firered. you can ask a friend that has that game to catch you a shellder and trade it to you.
you cant you can only get shellder in Pokemon fire red version sorry about it it made me mad to