When playing, I ran into a boss Mankey. I used Fake-out on it and it said "Mankey became confused out of fatigue" without even using a move.
Trying with another player, I found out that if you use Thrash (likely also the other similar moves) and get flinched, you get confused right away.

I think this might be a problem with how the disruption of the move is implemented.
I have not tested whether this happens with all reasons the move might fail. (paralyze, confusion, typing etc)