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There is a Legacy version here.

PFS StandardShared Stratagem Feat 2

Investigator 
Source Player Core 2 pg. 107 1.1

The plans you make include your allies as well as yourself. When you hit a creature with an attack on which you substituted your attack roll due to Devising a Stratagem, designate one ally. The creature you hit is off-guard to that ally on the next attack that ally makes against that creature before the start of your next turn.

Shared Stratagem Leads To...

Didactic Strike