FusionDex

The chest pieces of Klefmence contain a password-locked safe that they allow trusted Trainers to access and use to store valuables. Local governments have begun to take measures to avoid their poaching for the contents of the safe.

After many long years, its cellular structure underwent a sudden mutation to grow wings. 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.