AbilityToxic Sludge
At the end of each player's turn, each of your opponent's Active Pokémon that has any Grass Energy attached to it is now Poisoned. If that Pokémon is already Poisoned, Toxic Sludge Poké-Body does nothing to that Pokémon.

Muk is Pokédex #089, generation 1 (Kanto). Muk is a Stage 1 Psychic Pokémon with 80 HP. The card lists level 43. The card says it evolves from Grimer. In this catalog that name is Grimer (#088).
Muk sits at 56/132 in Secret Wonders, position 56 of 132. Before it is 55 Miltank, and after it is 57 Nidorino. The set belongs to the Diamond & Pearl series. It was released on November 1, 2007. The printed size is 132, and the checklist is the same length. The listed rarity is Uncommon.
Toxic Sludge is listed as Poké-Body. At the end of each player's turn, each of your opponent's Active Pokémon that has any Grass Energy attached to it is now Poisoned. If that Pokémon is already Poisoned, Toxic Sludge Poké-Body does nothing to that Pokémon. The attack Panic Liquid lists 50 damage. The cost is Psychic, Psychic, Colorless. The Defending Pokémon is now Confused and can't retreat during your opponent's next turn. Weakness is Psychic +20. Retreat cost is 2. The flavor text reads "A toxic fluids seeps from its body. The fluid instantly kills plants and trees on contact."
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 80 HP. The rarity there is Rare Holo, and here it is Uncommon. Mitsuhiro Arita illustrated that card, and Daisuke Ito illustrated this one. 29 other cards of Muk list a different HP.
The illustrator line reads Daisuke Ito. I count 47 other cards in the catalog with that illustrator.
Secret Wonders set binder is where a full Secret Wonders 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.
At the end of each player's turn, each of your opponent's Active Pokémon that has any Grass Energy attached to it is now Poisoned. If that Pokémon is already Poisoned, Toxic Sludge Poké-Body does nothing to that Pokémon.
The Defending Pokémon is now Confused and can't retreat during your opponent's next turn.
A toxic fluids seeps from its body. The fluid instantly kills plants and trees on contact.
Secret Wonders, in the Diamond & Pearl series. It was released on November 1, 2007. The printed size is 132.
56/132. It is entry 56 of 132 in this checklist.
Daisuke Ito. The catalog lists 47 other cards with that illustrator.
Uncommon.
Muk #089, generation 1 (Kanto).
Panic Liquid (50).