Its emotional instability is hard to handle for other Hatenna, so they don’t herd in the wild. They shuffle quietly along the forest floor alone, uncomfortable with most Pokémons’ enthusiasm. It can’t sense the emotions of Dark-Types, so Hatenna can get along quite well with them.

Hattrem uses psychic powers to control its hair as a cudgel, bashing whole trees down to get at berries. 90% of its diet goes to growing new hair. Older Trainers say the only emotion Hattrem will put up with is laughter, but Pokéologists consider this too dangerous to test.

You can feel wild Hatterenes’ presence long before you see them. The headaches it causes last for days unless treated with strong tea, and only get worse if you become emotional. Only Dark-Types can live nearby without suffering, making these forests even more dangerous.