Curse (move)

Curse is a Ghost-type status move.

Ghost-types
The user will lose half of its maximum HP (rounded down) and put a curse on the target. If the user has less than half of its maximum HP remaining, the move will execute fully but will cause the user to faint. A cursed Pokémon will lose ¼ of its maximum HP at the end of each turn. The curse will remain until the Pokémon switches out or if it faints, or if the battle ends.

All Other Types
The user lowers its Speed by one stage while increasing Attack and Defense by one stage each. It fails if Speed is at -6 and its Attack and Defense are both at +6. If the user is hit by Trick-or-Treat, Curse changes to have the Ghost-type effect instead, inflicting a Curse on the target and cutting its own HP, due to Trick-or-Treat's effect.

Trivia

 * Prior to Generation 5, Curse was ???-Type, the only Move with this type.
 * However, in the Spin-off Pokémon Game, Pokémon XD: Gale of Darkness, if Weather Ball is used while Shadow Sky is in effect, it will be a ???-type attack.
 * Nevertheless, since Generation 5, Curse became a Ghost-type Move, causing the ???-type to be retired.