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Speaking of poorly defined ground-types
>Doesn't burrow or live underground like drilbur or diglett
>doesn't live in the desert like krookodile or sandshrew
>isn't made of any earthen material like baltoy or sandyghast
>known for using rollout, which itself is rock-type for whatever reason
>pokemon like rhydon and tyranitar had already set the precedent that a pokemon can be rock type as long as it has a hard hide