[English > Japanese] one shot / one hit KO in english?

Is there a term for one shot-ing or for a one hit KO? Specifically in the context of something like pokemon

I've seen a term Ikken Hissatsu (一拳必殺) but isn't that moreso for a one hit kill rather than knockout? (Genuine question)

Is there like a slang term or other phrase that used in the context of pokemon or similar games?