The Focus Sash is an item, which if the holder has full HP and is hit by an attack that would otherwise cause fainting, it can survive with 1 HP. Can also protect against Swipe moves, recoil damage, and self-inflicted confusion damage, but not from Future Sight or Doom Desire. Consumed after use.
Locations
DPPt Route 221, Battle Tower/Frontier
HGSS Battle Frontier, Winner's Path