Even a robust wrestler will become dizzy and unable to stand when exposed to its 200,000-hertz ultrasonic waves.
– Pokémon Y Pokédex
Noibat is the only Flying/Dragon type (as opposed to Dragon/Flying). It and its evolution are the only dual-typed Flying Pokemon have have Flying as their primary type.
In the anime, Ash had a Noibat, which hatched from an egg he found.
Stat-wise it’s fast but doesn’t have a lot of defenses. It has the lowest BST of all Dragon types, even lower than Goomy, who is apparently “the weakest Dragon”