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There's too many good water types and while I love Cloyster I'm never in a position where I want to use a Shellder over another available water type before I finally find a water stone. The one time I actually decided to force myself to use Shellder was in Crystal and I completely forgot that you couldn't even get the water stone until post-e4 or by getting lucky with the phone battles, so I boxed him and picked up something else.