I love Seadra. I made the mistake to evolve my last one (wonder, high IV) into Kingdra which frankly is ugly and even got two Water type moves. I want to devolve him!
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Dragon/Ice Seadras were the best to prestige, or simply take out, Dragons. Kept all mine with high CP, and none water movesets
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I think there were many better options than Seadra, so I never used them.
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There were; but prestiging was as much about using the right CP as the right mon. There were a couple times were my Seadra was in the CP range that I was trying to use and my Cloyster and Lapras we're not.