Noivern is a large, draconic Pokémon that resembles a bat. It is primarily black with a purple underbelly and blue-green wing membranes. It has a purple lower jaw, a red, V-shaped growth on its snout, two fang-like projections on its upper lip, and yellow eyes with blue-green sclerae. Its large, teardrop-shaped ears have alternating rings of blue-green and black on the interiors and resemble loudspeakers. Around its neck is a fluffy mane of white fur that is longer in the back. Its wings have three red claws on the middle joint and are divided into segments by two black wing fingers. On the back of the wing, the final segment is purple. Noivern's feet have two toes each and a red, claw-like growth on top of each toe. It has a long, whip-like tail with a blue-green underside and two spines near the tip.
Noivern is known for its violent temper, but becomes tame if approached with its favorite ripe fruit. From its ears, it can produce ultrasonic waves strong enough to shatter large boulders. It uses these waves to freely navigate through darkness.
A Noivern appeared in the Hoopa's Surprise Ring Adventures short Wake Up, where it was among the Pokémon summoned by Hoopa to use their sound-based attacks to wake Ash, but to no avail. Two other Noivern appeared in the short In the Dark, where they were among the Pokémon rudely awakened by Hoopa's summoning of multiple Litwick.
Noivern can be seen as a parallel to Crobat. Both are Flying-type Pokémon based on bats that have Infiltrator as a possible Ability. They have the same base stat total and the same base HP, Defense, and Special Defense.