pokewalker or masterball
you have to get slobro to throw it of during a harsh battle!
The only way to get Cloyster is to evolve Shellder.
Shellder evolves when you use a water stone on it.
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.
you could say it is either, mew shadow lugia, or shellder, shellder's the best though.
Shellder only evolves when you use a water stone on it.
Shellder can be found in firered and leafgreen either you fish for one or look in seafoam islands.
Cloyster
You could catch a Shellder at Valley Windworks only by using your super rod
you cant you can only get shellder in Pokemon fire red version sorry about it it made me mad to
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 use a good rod in vermillion city, and you have a good chance of finding it. This is the easiest way to get shellder in yellow. And just in case you were wondering, you evolve shellder into cloyster with a water stone.