Curse
From Pixelmon Wiki
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Curse is a Ghost-type move that works differently for Ghost-type Pokémon than other Pokémon.
For non-Ghost-type Pokémon, Curse raises the user's Attack and Defense by one stage and lowers the user's Speed by one stage.
For Ghost-type Pokémon, Curse will cause the user to lose 50% of their HP (possibly fainting) and the opponent will be afflicted with the cursed status. A cursed Pokémon will lose 25% of their HP every turn. The status wears off when the afflicted Pokémon switches out.