AbilityCatastrophe
As long as Gengar is your Active Pokémon, if any of your opponent's Pokémon would be Knocked Out, put that Pokémon in the Lost Zone instead of discarding. (Discard all cards attached to that Pokémon.)

Gengar is Pokédex #094, generation 1 (Kanto). Gengar is a Stage 2 Prime Psychic Pokémon with 130 HP. The card says it evolves from Haunter. In this catalog that name is Haunter (#093).
Gengar sits at 94/102 in HS—Triumphant, position 94 of 103. Before it is 93 Electrode, and after it is 95 Machamp. The set belongs to the HeartGold & SoulSilver series. It was released on November 3, 2010. The printed size is 102. This checklist is longer, at 103 cards. The listed rarity is Rare Prime.
Catastrophe is listed as Poké-Body. As long as Gengar is your Active Pokémon, if any of your opponent's Pokémon would be Knocked Out, put that Pokémon in the Lost Zone instead of discarding. (Discard all cards attached to that Pokémon.) The attack Hurl into Darkness lists no damage number. The cost is Psychic. Look at your opponent's hand and choose a number of Pokémon you find there up to the number of Psychic Energy attached to Gengar. Put the Pokémon you chose in the Lost Zone. Cursed Drop is another attack lists no damage number. The cost is Psychic, Colorless. Put 4 damage counters on your opponent's Pokémon in any way you like. Weakness is Darkness ×2. Resistance is Colorless -20.
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 130 HP. The rarity there is Rare Holo, and here it is Rare Prime. Keiji Kinebuchi illustrated that card, and Takashi Yamaguchi illustrated this one. 43 other cards of Gengar list a different HP.
The illustrator line reads Takashi Yamaguchi. I count 18 other cards in the catalog with that illustrator.
HS—Triumphant set binder is where a full HS—Triumphant set goes. This card fills one slot there. 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.
As long as Gengar is your Active Pokémon, if any of your opponent's Pokémon would be Knocked Out, put that Pokémon in the Lost Zone instead of discarding. (Discard all cards attached to that Pokémon.)
Look at your opponent's hand and choose a number of Pokémon you find there up to the number of Psychic Energy attached to Gengar. Put the Pokémon you chose in the Lost Zone.
Put 4 damage counters on your opponent's Pokémon in any way you like.
HS—Triumphant, in the HeartGold & SoulSilver series. It was released on November 3, 2010. The printed size is 102.
94/102. It is entry 94 of 103 in this checklist.
Takashi Yamaguchi. The catalog lists 18 other cards with that illustrator.
Rare Prime.
Gengar #094, generation 1 (Kanto).
Hurl into Darkness and Cursed Drop.