Curse

If the user is Ghost-type, it loses half its max HP and puts a curse on the target. Also works if the user has less than half of its max HP left. A cursed Pokémon loses 1/4 of its max HP each turn, until the Pokémon switches out or the battle ends. This move is not blocked by Protect, Detect or Spiky Shield, but is blocked by Crafty Shield. The user does not lose HP if the move misses, fails, or is blocked by Crafty Shield. If the user is not Ghost-type, its Speed will drop by 1 stage and its Attack and Defense rise by 1 stage. It fails if there are no foes on the field. If the user changes to Ghost-type before using Curse in a Double Battle, it will target its ally if the user is on the right side, or a random foe if the user is on the left side. If this happens in Triple Battles, it will target a random adjacent opponent. If the user becomes Ghost-type due to Protean upon executing Curse, it will use the Ghost-type Curse on itself. This cannot be blocked by Crafty Shield.