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I never thought of Power Trick as a viable move in singles.
if you use it without trick room, you'll still attack last and get ohko'd next turn.
If you use it with trick room and the opponent attacks in the same turn, you get ohko'd at that turn.
Only viable scenario for that move in my mind is in a trick doubles team,where shuckle sets up the power trick on the same turn as your team mate sets trick room.