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Might as well be the posterboy for the thread. Nearly always available early, has Intimidate in Gen 3, and by Gen 4 with the Phys/Special split it goes from solid to busted because it learns Dragon Dance and Ice Fang/Water STAB naturally.
Its special was 100 in OG Gen 1 so it was also really good there. Its lowest point is probably OG Gen 2 but even then it's far from the worst thing you could use there.
Babying Magikarp to Level 20 is hardly a hassle, it really isn't that high of a level and you can probably find a Magikarp later down the road that exceeds this level or is close