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Noivern is a large bat-like Pokémon with enormous ears suited for precise hearing. It has a mane of white fur sprouting around its neck and upper back. Noivern has two black wings lined with a dusky purple and has maroon grasping claws. A teal membrane fans between its ribcage and wings. When its mouth is open, two pointed teeth can be seen on its lower jaw.
From its ears, Noivern releases ultrasonic waves, which can be strong enough to shatter a large boulder. It uses these waves to freely navigate through darkness, allowing it to easily ambush prey under cover of night. Noivern is known to be extremely combative toward anything that wanders too close to it. It loves eating fruit; thus, approaching it with fruit helps to keep it calm.