AttackSlow-Acting Poison
At the end of your opponent's next turn, the Defending Pokémon is now Poisoned.

Sharpedo is Pokédex #319, generation 3 (Hoenn). Team Aqua's Sharpedo is a Stage 1 Water Pokémon with 70 HP. The card says it evolves from Team Aqua's Carvanha. In this catalog that name is Carvanha (#318).
Team Aqua's Sharpedo sits at 18/95 in Team Magma vs Team Aqua, position 18 of 97. Before it is 17 Team Aqua's Seviper, and after it is 19 Team Magma's Camerupt. The set belongs to the EX series. It was released on March 1, 2004. The printed size is 95. This checklist is longer, at 97 cards. The listed rarity is Rare.
The attack Slow-Acting Poison lists 20 damage. The cost is Colorless, Colorless. At the end of your opponent's next turn, the Defending Pokémon is now Poisoned. Aqua Smash is another attack lists 50+ damage. The cost is Water, Water, Colorless. If the Defending Pokémon is affected by a Special Condition, this attack does 50 damage plus 20 more damage. Weakness is Lightning ×2.
Sharpedo (#319) has 25 other cards in the catalog. Those other cards are in 21 sets. The other printings with a release date run from 2003 to 2025. The earliest other card is Sharpedo 22/109 in Ruby & Sapphire (2003). That card is named Sharpedo, while this one is Team Aqua's Sharpedo. Both list 70 HP. Both list the rarity Rare. Hajime Kusajima illustrated that card, and Katsura Tabata illustrated this one. 21 other cards of Sharpedo list a different HP.
The illustrator line reads Katsura Tabata. I count 35 other cards in the catalog with that illustrator.
Team Magma vs Team Aqua set binder is where a full Team Magma vs Team Aqua set goes. This card fills one slot there. A generation binder holds one card of each species. Sharpedo can fill a slot in Generation 3 binder (Hoenn). Themed lists that include this exact card are Trainer's Pokémon. I still need this card.
At the end of your opponent's next turn, the Defending Pokémon is now Poisoned.
If the Defending Pokémon is affected by a Special Condition, this attack does 50 damage plus 20 more damage.
Team Magma vs Team Aqua, in the EX series. It was released on March 1, 2004. The printed size is 95.
18/95. It is entry 18 of 97 in this checklist.
Katsura Tabata. The catalog lists 35 other cards with that illustrator.
Rare.
Sharpedo #319, generation 3 (Hoenn).
Slow-Acting Poison (20) and Aqua Smash (50+).