AttackHyper Beam
Flip a coin. If heads, discard 1 Energy attached to the Defending Pokémon.

Claydol is Pokédex #344, generation 3 (Hoenn). Claydol is a Stage 1 Fighting Pokémon with 80 HP. The card says it evolves from Baltoy. In this catalog that name is Baltoy (#343).
Claydol sits at 31/101 in Hidden Legends, position 31 of 102. Before it is 30 Castform, and after it is 32 Corsola. The set belongs to the EX series. It was released on June 1, 2004. The printed size is 101. This checklist is longer, at 102 cards. The listed rarity is Uncommon.
The attack Hyper Beam lists 20 damage. The cost is Psychic, Colorless. Flip a coin. If heads, discard 1 Energy attached to the Defending Pokémon. Ram is another attack lists 50 damage. The cost is Fighting, Colorless, Colorless. Weakness is Water ×2. Retreat cost is 1.
Claydol (#344) has 23 other cards in the catalog. Those other cards are in 21 sets. The other printings with a release date run from 2004 to 2026. The earliest other card is Team Magma's Claydol 8/95 in Team Magma vs Team Aqua (2004). That card is named Team Magma's Claydol, while this one is Claydol. Both list 80 HP. The rarity there is Rare Holo, and here it is Uncommon. Zu-Ka illustrated that card, and Ken Sugimori illustrated this one. Retreat cost there is 2, and here it is 1. 15 other cards of Claydol list a different HP.
The illustrator line reads Ken Sugimori. I count 1,112 other cards in the catalog with that illustrator.
Hidden Legends set binder is where a full Hidden Legends set goes. This card fills one slot there. A generation binder holds one card of each species. Claydol can fill a slot in Generation 3 binder (Hoenn). I still need this card.
Flip a coin. If heads, discard 1 Energy attached to the Defending Pokémon.
Hidden Legends, in the EX series. It was released on June 1, 2004. The printed size is 101.
31/101. It is entry 31 of 102 in this checklist.
Ken Sugimori. The catalog lists 1,112 other cards with that illustrator.
Uncommon.
Claydol #344, generation 3 (Hoenn).
Hyper Beam (20) and Ram (50).