Please check West Hills for the next one I heard somewhere there seen it.
Complete a battle containing a Faceless.
Note: You must visit Rosie first to start the quest.
Talk to Tsukanasti in Bleakwoods: D4, then complete a battle containing a Faceless.
Go North twice, then West twice to get to Ash's Hut at Bleakwoods: B2, and kill the 16800 HP Faceless in Battle 3 (far right). For an easier fight, go to Bellroot: A1. Return to and talk to Tsukanasti to complete the quest, then return to Rosie.