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Charizard was great in gen 1. Maybe not too great since it was a fire-type, but it traded Ground-immunity for 4X Rock weakness and there's more Pokemon that carry Earthquake than Rock Slide in gen 1 competitive play because of the greater base power- it is, according to Smogon, only seen on Rock types that learn it as well as Primeape, Sandslash and maybe Machamp, along with some others.
