AttackFury
Does 20 damage times the number of damage counters on Whiscash.

Whiscash is Pokédex #340, generation 3 (Hoenn). Whiscash is a Stage 1 Water Pokémon with 90 HP. The card lists level 41. The card says it evolves from Barboach. In this catalog that name is Barboach (#339).
Whiscash sits at 40/123 in Mysterious Treasures, position 40 of 124. Before it is 39 Walrein, and after it is 41 Bayleef. The set belongs to the Diamond & Pearl series. It was released on 1 August 2007. The printed size is 123. This checklist is longer, at 124 cards. The listed rarity is Rare.
The attack Fury lists 20× damage. The cost is Water, Colorless, Colorless. Does 20 damage times the number of damage counters on Whiscash. Magnitude is another attack lists 60 damage. The cost is Fighting, Colorless, Colorless, Colorless. Does 20 damage to each Benched Pokémon (both yours and your opponent's). (Don't apply Weakness and Resistance for Benched Pokémon.) Weakness is Grass +30. Resistance is Lightning -20. Retreat cost is 3. The flavor text reads "It is very territorial. It repels foes by setting of tremors that extend over a three-mile radius."
Whiscash (#340) has 10 other cards in the catalog. Those other cards are in 9 sets. The other printings with a release date run from 2003 to 2023. The earliest other card is Whiscash 48/97 in Dragon (2003). Both list 90 HP. The rarity there is Uncommon, and here it is Rare. Tomokazu Komiya illustrated that card, and Daisuke Ito illustrated this one. Retreat cost there is 2, and here it is 3. 8 other cards of Whiscash list a different HP.
The illustrator line reads Daisuke Ito. I count 47 other cards in the catalog with that illustrator.
Mysterious Treasures set binder is where a full Mysterious Treasures set goes. This card fills one slot there. A generation binder holds one card of each species. Whiscash can fill a slot in Generation 3 binder (Hoenn). I still need this card.
Does 20 damage times the number of damage counters on Whiscash.
Does 20 damage to each Benched Pokémon (both yours and your opponent's). (Don't apply Weakness and Resistance for Benched Pokémon.)
It is very territorial. It repels foes by setting of tremors that extend over a three-mile radius.
Mysterious Treasures, in the Diamond & Pearl series. It was released on 1 August 2007. The printed size is 123.
40/123. It is entry 40 of 124 in this checklist.
Daisuke Ito. The catalog lists 47 other cards with that illustrator.
Rare.
Whiscash #340, generation 3 (Hoenn).
Fury (20×) and Magnitude (60).