[quote=@Crusader Lord]
<Snipped quote by Yankee>

Hatenna, looking at a Grimmsnarl in the wild, utterly undeterred and with all the aura of an angry chihuahua: [s]"Today I choose....viiiiiiiiiiiiiiiiiiiiiiiiiiiiolence."[/s] [i]"Ha ha....teeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeennnnnnnna!"[/i]
[/quote]

Pokedex [Hattrem]: "The moment this Pokémon finds someone who's emitting strong emotions, it will pummel them senseless with its braids to silence them."

One feeds on negative emotions (Impidimp). The other [b][i]silences[/i][/b] them. 

Maybe it's actually done to starve the Impidimp o.o

[s]EDIT: Also goes without saying, but I can think of at least two characters who may be cooked the moment they meet a Hattrem XD[/s]