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Kleflithe are loyal and trustworthy creatures who will fiercely protect their Trainer's keys and other valuables no matter what. This includes digging holes to bury them. If given an important key, they wear it proudly.

Its superb sense of smell ensures that this Pokémon won't forget any scent, no matter what. It never lets go of a key that it likes, so people give it the keys to vaults and safes as a way to prevent crime.