Then I am blaming the sub. She actually commanded Piplup to use "Doriru Kuchibashi", which means Drill Peck. So, there is no doubt about it.
Same for today's episode --> "Zutsuki" (Headbutt)
Oh, so maybe I somehow thought "zutsuki" was "tsuzuki' which is Peck... ok, so apparently Pip currently knows: BubbleBeam / Ice Beam / Hydro Pump / Drill Peck / Headbutt ? and that's 5 moves... wtf, Headbutt was really ridiculous in my opinion, they could just not do it and keep it at 4 like they tried to do so far... oh well