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I get Ground Type Pokes live underground/likes to dig (Diglett, Sandshrew, Drilbur, Trapinch, Diggersby, etc) or are made of ground/sand/dirt (Sandygast, Baltoy)
But what's the deal with Garchomp, Seismitoad, Gastrodon, Whiscash, Swampert, Nodoking, Nidoqueen, Gliscor, Marowak, etc.
A shit ton of them are extremely random.