Sources:
http://bulbapedia.bulbagarden.net/wiki/Shellder#Game_locations
when u get an Shellder. the only way to evolve it is using a water stone! sadly, i used my water stone on my eevee a long time ago! (i am mad at myself)
fishing is a good way to find one. check for its area locations in the pokedex, then go fishing there. if u don't have it in, go fishing around the docks or vermilion city, that's where i found some.
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Super Rod.
Sorry to say, but you can't catch Cloyster. You have to catch a Shellder with a Water Stone. You can catch a Shellder by fishing in Olivine City (SS Aqua Entrance), Vermillion City, Cinnabar Island, Seafoam Island and on Route 21.
You can catch shellder in the museum at Oreburgh city,,, to catch it you must go through a secret passageway in the back and you ill find a secret garden with shellder's and eevee's. It don't work wheres the secert passageway.!!!.!!!?!!! There is no such thing. You get a shielder on route 205 with a super rod, and eevee are found in the Trophy Garden or in front of the mansion.
No, you have to trade it from FireRed or Pokémon XD: Gale of Darkness
Only in Fire Red,xd and gold/silver/crystal Fire Red: Shellder is common at One Island, Five Island, and Vermillion City. XD: Only one, capture from Cipher Peon Gorog in Cipher Key Lair. Information from the Pokemon Pocket Pokedex book. shellder is at vermillion city and olivine at the docks.