Almost always goes first. The user is protected from all attacks for one turn, but the move's success rate halves with each consecutive use of Protect, Detect or Endure. If a Pokemon has No Guard, or used Lock-On or Mind Reader against the user during the previous turn, its attack has a [100 - move's normal accuracy]% chance to hit through Protect; OHKO moves do not benefit from this effect. Blizzard has a 30% to hit through this move during Hail, as does Thunder during Rain Dance.
The user eats the target's held berry and, if applicable, receives its benefits. Jaboca Berry will be removed without damaging the user, but Tanga Berry will still activate and reduce this move's power. The target can still recover its held berry by using Recycle.