Octolock

Prevents the target from switching out. At the end of each turn during effect, the target's Defense and Special Defense are lowered by 1 stage. The target can still switch out if it is holding Shed Shell or uses Baton Pass, Flip Turn, Parting Shot, Teleport, U-turn, or Volt Switch. If the target leaves the field using Baton Pass, the replacement will remain trapped. The effect ends if the user leaves the field.