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There is a Legacy version here.

PFS StandardFlexible Studies Feat 1

Investigator 
Source Player Core 2 pg. 106

You've collected a cross-section of information on various disciplines you can refer to when preparing for various tasks. During your daily preparations, you can cram on a certain subject to become temporarily trained in one skill of your choice. This proficiency lasts until you prepare again. As this proficiency is temporary, you can't use it as a prerequisite for a permanent character option like a skill increase or a feat.