If a cursed Pokémon defeats its opponent, it now takes curse damage on that turn. (However, Curse will still fail if the user's Attack and Defense stats both are at +6 stages, and its Speed stat is at -6 stages.) If used by a non- Ghost-type Pokémon, Curse can now reduce the user's Speed stat even if its Attack and Defense stats both are at +6 stages. If a cursed Pokémon defeats its opponent, it will not take curse damage on that turn. If used by a non- Ghost-type Pokémon, Curse will fail if the user's Attack and Defense stats both are at +6 stages, even if its Speed stat is not at -6 stages. If powered up by a Ghostium Z into Z-Curse, the user's Attack stat raises another stage. Despite being an effect acting on the user, this move will fail if there are no opponents on the field. The user's Speed stat will drop by one stage and its Attack stat and Defense stat will rise by one stage each. If powered up by a Ghostium Z into Z-Curse, the user restores all of its HP. The user does not lose HP if Curse misses (due to a move with a semi-invulnerable turn), fails (due to the target already being affected by Curse), or is blocked by Crafty Shield. This move is not blocked by Protect, Detect, or Spiky Shield, but is blocked by Crafty Shield. The curse will remain until the Pokémon switches out or the battle ends. A cursed Pokémon will lose ¼ of its maximum HP at the end of each turn. If this causes the user's HP to drop to 0, the move will execute fully but cause the user to faint.

The user will lose half of its maximum HP (rounded down) and put a curse on the target. In all generations, Curse acts differently depending on whether the user has the Ghost type or not.

What is a curse account