Hatenna is a small Pokémon with a round pink body and a pair of small feet. Most of its body is covered by a blue wig-like feature with a pink hat-like protrusion on top. This protrusion is decorated with a white spot and has a blue bulbous growth on its tip. The flaps on the side of its head appears to be able to function like limbs.
A reclusive Pokémon, it has a strong sense of emotion, being able to sense other creatures' emotions via the protrusion on its head. It never warms up to people that do not have a calm disposition.
In the anime
In the manga
In the TCG
This Pokémon was unavailable prior to Generation VIII.
Hatenna and Impidimp's evolutionary lines can be considered counterparts. Both are Generation VIII Pokémon evolving once at level 32, then at level 42. The Impidimp evolution line is male only, while the Hatenna line is female only. Their final evolved forms are both Fairy-type Pokémon with identical base experience and catch rates, and each Pokémon in each evolution line have the same base stat total as their counterpart (e.g. Impidimp and Hatenna both have a base stat total of 265).