Fully invested, physically defensive Gligar is indeed a counter to CB Durant, as it takes 2 hits of Durant's most effective attack to hit Gligar with, Iron Head, after Stealth Rock and can proceed to heal the damage with Roost. Even though Earthquake only 3HKOes after 1 round of hazard damage, Knock Off further aids Gligar in weakening Durant's attacking prowess, while at the same time reducing the chanches to flinch from Iron Head. However, it should be kept in mind that Defog Gligar is highly susceptible to Toxic from common hazard setters such as Registeel, Rhyperior and Gigalith, which can lessen Gligar's ability to appropriately counter CB Durant.