Flip a coin. If heads, put a Curse marker on the Defending Pokémon. When a Pokémon with a Curse marker on it is damaged by an attack by a Pokémon it has Weakness to, that attack’s damage is quadrupled instead of doubled. (The effect is the same if a Pokémon has multiple Curse Markers on it.) (Curse markers stay on the Pokémon as long as it remains in play.)