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Is there anything preventing a character from using, for example, Stunning Fist on the same attack as he uses Befuddling Strike, Perfect Strike (with a Ki Focus weapon), Scorpion Style, or similar feats?
As far as I can tell from the descriptions the only limit on them is that you can only use each once per round, or in the case of Scorpion Style, as a standard action.
Since Scorpion Style is the only feat that has an activation cost, the use of a standard action. Each of the other feats only require that you declare expending a use of them prior to making an attack roll. This makes sense, since Scorpion Style has an unlimited number of uses, while each of the other feats have a limit of only a handful (ha!) of uses per day. This also makes sense when viewed from the perspective of making a Full Attack as a monk, as each of these feats (except Scorpion Style of course) can be activated on any attack as part of a full attack, since they have no activation cost outside of declaring that you're using it.
Since Scorpion Style and Befuddling Strike require an Unarmed Strike specifically to be used, and Ki Focus only works with a Ki ability, Stunning Fist, or Quivering Palm. They are mutually exclusive with Perfect Strike. Since Ki Focus specifically allows Stunning Fist, that can be combined with Perfect Strike, so you can use Stunning Fist + Perfect Strike or Scorpion Style + Stunning Fist + Befuddling Strike, but not all four.
