AttackNasty Goo
Flip a coin. If heads, the Defending Pokémon is now Paralyzed.

Grimer is Pokédex #088, generation 1 (Kanto). Grimer is a Basic Grass Pokémon with 50 HP. The card lists level 17. The card lists Muk, Muk (#089) under evolves to.
Grimer sits at 48/62 in Fossil, position 48 of 62. Before it is 47 Geodude, and after it is 49 Horsea. The set belongs to the Base series. It was released on October 10, 1999. The printed size is 62, and the checklist is the same length. The listed rarity is Common.
The attack Nasty Goo lists 10 damage. The cost is Colorless. Flip a coin. If heads, the Defending Pokémon is now Paralyzed. Minimize is another attack lists no damage number. The cost is Grass. All damage done by attacks to Grimer during your opponent's next turn is reduced by 20 (after applying Weakness and Resistance). Weakness is Psychic ×2. Retreat cost is 1. The flavor text reads "Appears in filthy areas. Thrives by sucking up polluted sludge that is pumped out of factories."
Grimer (#088) has 24 other cards in the catalog. Those other cards are in 23 sets. The other printings with a release date run from 2000 to 2025. The earliest other card is Grimer 57/82 in Team Rocket (2000). That card lists 40 HP, and this one lists 50 HP. Both list the rarity Common. Kagemaru Himeno illustrated that card, and Mitsuhiro Arita illustrated this one. 19 other cards of Grimer list a different HP.
The illustrator line reads Mitsuhiro Arita. I count 721 other cards in the catalog with that illustrator.
Fossil set binder is where a full Fossil set goes. This card fills one slot there. A generation binder holds one card of each species. Grimer can fill a slot in Generation 1 binder (Kanto). Themed lists that include this exact card are Mitsuhiro Arita cards. I still need this card.
Flip a coin. If heads, the Defending Pokémon is now Paralyzed.
All damage done by attacks to Grimer during your opponent's next turn is reduced by 20 (after applying Weakness and Resistance).
Appears in filthy areas. Thrives by sucking up polluted sludge that is pumped out of factories.
Fossil, in the Base series. It was released on October 10, 1999. The printed size is 62.
48/62. It is entry 48 of 62 in this checklist.
Mitsuhiro Arita. The catalog lists 721 other cards with that illustrator.
Common.
Grimer #088, generation 1 (Kanto).
Nasty Goo (10) and Minimize.