AttackSmog
The Defending Pokémon is now Poisoned.

Houndour is Pokédex #228, generation 2 (Johto). Houndour is a Basic Fire Pokémon with 50 HP. The card lists Houndoom, Houndoom (#229) under evolves to.
Houndour sits at 60/115 in Unseen Forces, position 62 of 145. Before it is 59 Hoothoot, and after it is 61 Larvitar. The set belongs to the EX series. It was released on August 1, 2005. The printed size is 115. This checklist is longer, at 145 cards. The listed rarity is Common.
The attack Smog lists no damage number. The cost is Fire. The Defending Pokémon is now Poisoned. Weakness is Water ×2. Retreat cost is 1.
Houndour (#228) has 31 other cards in the catalog. Those other cards are in 22 sets. The other printings with a release date run from 2001 to 2025. The earliest other card is Houndour 5/75 in Neo Discovery (2001). Both list 50 HP. The rarity there is Rare Holo, and here it is Common. Aya Kusube illustrated that card, and Kagemaru Himeno illustrated this one. 12 other cards of Houndour list a different HP.
The illustrator line reads Kagemaru Himeno. I count 656 other cards in the catalog with that illustrator.
Unseen Forces set binder is where a full Unseen Forces set goes. This card fills one slot there. A generation binder holds one card of each species. Houndour can fill a slot in Generation 2 binder (Johto). I still need this card.
The Defending Pokémon is now Poisoned.
Unseen Forces, in the EX series. It was released on August 1, 2005. The printed size is 115.
60/115. It is entry 62 of 145 in this checklist.
Kagemaru Himeno. The catalog lists 656 other cards with that illustrator.
Common.
Houndour #228, generation 2 (Johto).
Smog.