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They were quite aware of how elite Garchomp was when they created it, so the Pokémon was forever forbidden from learning Earthquake by levelup, or Dragon Dance at ALL.
Additionally, the Japanese name for Sand Rush is Sand Paddle. As in, swimming through sand as though it were water. This is a LAND SHARK. You thought Excadrill was a nightmare? Imagine if Garchomp had Sand Rush in Gen V.