Sometimes it works, sometimes I get hit.
I'm thinking about using it at first of battle when they are sword dancing/nasty plotting/calm minding.
It's a good idea to run Substitute when you're using a Pokemon with Focus Punch, since when the Pokemon is behind the sub it will always be able to pull off the Focus Punch unless the opponent uses a move such as Bullet Seed which can hit through the sub, but such scenario is unlikely.
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