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In R/B/G I would say Dugtrio. Top 5 speed in the game, plus Dig did more damage back then.
In G/S/C I would say Marowak with Thick Club or whatever the hold item was...
In R/S/E I like Claydol, part Psychic is is awesome.
Sandshrew was the first Pokemon I ever saw though, back on the elementary school playground, so I have a soft spot for that line.