So I was in a mystery dungeon when I came across a sleeping Klang. I got right up to it and tried using Thundershock on it. No damage done, Klang stayed asleep. Tried again with Quick Attack, no damage, still asleep. Not even my normal attacks or paralyzing it would wake it up.
So what's up with that then?
Location was the Mystery Dungeon you go to to rescue Dunsparce from the Pawnairds.