Super Rod.
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i would use a super rod. if this is the gen 1 games (red yellow blue fire red or leaf green) you can catch him where the SS anne was (i think you can only catch him on blue or fire red but im not positive)
You need to use a super rod
Use a good rod in seafoam islands.
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.
I think super rod. Anyway, that's what you need in red version, but it probably won't make any difference to blue version.