I specifically recall my Halfling rogue was supposed to have the ability to use bluff in lieu of intimidate (or was it diplomacy) for the purposes of improving someone's attitude towards you. I'm not sure if it was from an archetype, a alternate racial trait, a feat or a trait... But I remember reading it, and then choosing to put ranks in bluff and none in diplomacy or intimidate...
Can amyone help me?
You might be looking for the Coax Information Rogue Talent from the Pathfinder Unchained rulebook:
Coax Information (Ex): A rogue with this talent can use Bluff or Diplomacy in place of Intimidate to force an opponent to act friendly toward her. When the duration of the attitude shift ends, that opponents’ attitude toward the rogue returns to its previous level, rather than dropping one level.
Ah! Yes! Thank you!