AttackWhirlpool
Flip a coin. If heads, discard an Energy card attached to the Defending Pokémon.

Mudkip is Pokédex #258, generation 3 (Hoenn). Mudkip ★ is a Basic Star Water Pokémon with 70 HP.
Mudkip ★ sits at 107/109 in Team Rocket Returns, position 107 of 111. Before it is 106 Rocket's Zapdos ex, and after it is 108 Torchic ★. The set belongs to the EX series. It was released on November 1, 2004. The printed size is 109. This checklist is longer, at 111 cards. The listed rarity is Rare Holo Star.
The attack Whirlpool lists no damage number. The cost is Water. Flip a coin. If heads, discard an Energy card attached to the Defending Pokémon. Spring Back is another attack lists 20+ damage. The cost is Water, Water. If your opponent has only 1 Prize card left, this attack does 20 damage plus 50 more damage and the Defending Pokémon is now Asleep. Weakness is Lightning ×2. Retreat cost is 1. The card text says: You can't have more than 1 Pokémon Star in your deck.
Mudkip (#258) has 19 other cards in the catalog. Those other cards are in 14 sets. The other printings with a release date run from 2003 to 2021. The earliest other card is Mudkip 59/109 in Ruby & Sapphire (2003). That card is named Mudkip, while this one is Mudkip ★. That card lists 50 HP, and this one lists 70 HP. The rarity there is Common, and here it is Rare Holo Star. Mitsuhiro Arita illustrated that card, and Masakazu Fukuda illustrated this one. 17 other cards of Mudkip list a different HP.
The illustrator line reads Masakazu Fukuda. I count 471 other cards in the catalog with that illustrator.
Team Rocket Returns set binder is where a full Team Rocket Returns set goes. This card fills one slot there. A generation binder holds one card of each species. Mudkip can fill a slot in Generation 3 binder (Hoenn). I still need this card.
Flip a coin. If heads, discard an Energy card attached to the Defending Pokémon.
If your opponent has only 1 Prize card left, this attack does 20 damage plus 50 more damage and the Defending Pokémon is now Asleep.
You can't have more than 1 Pokémon Star in your deck.
Team Rocket Returns, in the EX series. It was released on November 1, 2004. The printed size is 109.
107/109. It is entry 107 of 111 in this checklist.
Masakazu Fukuda. The catalog lists 471 other cards with that illustrator.
Rare Holo Star.
Mudkip #258, generation 3 (Hoenn).
Whirlpool and Spring Back (20+).