AbilityPoison Sacs
Your opponent's Poisoned Pokémon don't recover from that Special Condition when they evolve or devolve.

Muk is Pokédex #089, generation 1 (Kanto). Muk is a Stage 1 Darkness Pokémon with 140 HP. The card says it evolves from Grimer. In this catalog that name is Grimer (#088).
Muk sits at 127/198 in Scarlet & Violet, position 127 of 258. Before it is 126 Grimer, and after it is 128 Seviper. The set belongs to the Scarlet & Violet series. It was released on March 31, 2023. The printed size is 198. This checklist is longer, at 258 cards. The listed rarity is Uncommon.
Poison Sacs is listed as Ability. Your opponent's Poisoned Pokémon don't recover from that Special Condition when they evolve or devolve. The attack Toxic Strike lists 100 damage. The cost is Darkness, Colorless, Colorless, Colorless. Your opponent's Active Pokémon is now Poisoned. Weakness is Fighting ×2. Retreat cost is 4. The flavor text reads "It's thickly covered with a filthy, vile sludge. It is so toxic, even its footprints contain poison." The regulation mark is G.
Muk (#089) has 31 other cards in the catalog. Those other cards are in 23 sets. The other printings with a release date run from 1999 to 2025. The earliest other card is Muk 13/62 in Fossil (1999). That card lists 70 HP, and this one lists 140 HP. The rarity there is Rare Holo, and here it is Uncommon. Mitsuhiro Arita illustrated that card, and Haru Akasaka illustrated this one. Retreat cost there is 2, and here it is 4. 29 other cards of Muk list a different HP.
The illustrator line reads Haru Akasaka. I count 16 other cards in the catalog with that illustrator.
Scarlet & Violet set binder is where a full Scarlet & Violet set goes. This card fills one slot there. A generation binder holds one card of each species. Muk can fill a slot in Generation 1 binder (Kanto). I still need this card.
Your opponent's Poisoned Pokémon don't recover from that Special Condition when they evolve or devolve.
Your opponent's Active Pokémon is now Poisoned.
It's thickly covered with a filthy, vile sludge. It is so toxic, even its footprints contain poison.
Scarlet & Violet, in the Scarlet & Violet series. It was released on March 31, 2023. The printed size is 198.
127/198. It is entry 127 of 258 in this checklist.
Haru Akasaka. The catalog lists 16 other cards with that illustrator.
Uncommon.
Muk #089, generation 1 (Kanto).
G.
Toxic Strike (100).