AbilityShadow Curse
If Gengar would be Knocked Out by damage from an opponent's attack, you may put 3 damage counters on 1 of your opponent's Pokémon.

Legend Maker is a set in the EX series. It was released on February 1, 2006. The printed size is 92. This checklist is longer, at 93 cards. Gengar is 5/92, in position 5 of 93 on this checklist. Before it is 4 Delcatty, and after it is 6 Golem. The listed rarity is Rare Holo.
Gengar is a Stage 2 Psychic Pokémon with 100 HP. In the Pokédex this is Gengar (#094), generation 1 (Kanto). The card says it evolves from Haunter. In this catalog that name is Haunter (#093).
Kouki Saitou illustrated this card. The same name is on 652 other cards in the catalog.
Gengar (#094) has 52 other cards in the catalog. Those other cards are in 34 sets. The other printings with a release date run from 1999 to 2026. The earliest other card is Gengar 5/62 in Fossil (1999). That card lists 80 HP, and this one lists 100 HP. Both list the rarity Rare Holo. Keiji Kinebuchi illustrated that card, and Kouki Saitou illustrated this one. 50 other cards of Gengar list a different HP.
Shadow Curse is listed as Poké-Power. If Gengar would be Knocked Out by damage from an opponent's attack, you may put 3 damage counters on 1 of your opponent's Pokémon. The attack Cursed Reaction lists no damage number. The cost is Psychic. Put 2 damage counters on your opponent's Pokémon in any way you like. If Gengar has any React Energy cards attached to it, put 4 damage counters instead. Super Psy Bolt is another attack lists 60 damage. The cost is Psychic, Psychic, Colorless. Weakness is Darkness ×2. Resistance is Fighting -30. Retreat cost is 1.
I keep a set binder for Legend Maker, meant to hold every card of that set. This card is one slot in the Legend Maker set binder. A generation binder holds one card of each species. Gengar can fill a slot in Generation 1 binder (Kanto). Themed lists that include this exact card are Gengar and the Gastly line. I still need this card.
If Gengar would be Knocked Out by damage from an opponent's attack, you may put 3 damage counters on 1 of your opponent's Pokémon.
Put 2 damage counters on your opponent's Pokémon in any way you like. If Gengar has any React Energy cards attached to it, put 4 damage counters instead.
Legend Maker, in the EX series. It was released on February 1, 2006. The printed size is 92.
5/92. It is entry 5 of 93 in this checklist.
Kouki Saitou. The catalog lists 652 other cards with that illustrator.
Rare Holo.
Gengar #094, generation 1 (Kanto).
Cursed Reaction and Super Psy Bolt (60).