AttackPlasma
If there are any Lightning Energy cards in your discard pile, attach 1 of them to Rocket's Zapdos.

Gym Challenge is a set in the Gym series. It was released on October 16, 2000. The printed size is 132, and the checklist is the same length. Rocket's Zapdos is 15/132, in position 15 of 132 on this checklist. Before it is 14 Rocket's Mewtwo, and after it is 16 Sabrina's Alakazam. The listed rarity is Rare Holo.
Rocket's Zapdos is a Basic Lightning Pokémon with 70 HP. The card lists level 34. In the Pokédex this is Zapdos (#145), generation 1 (Kanto).
Shin-ichi Yoshida illustrated this card. The same name is on 50 other cards in the catalog.
Zapdos (#145) has 49 other cards in the catalog. Those other cards are in 34 sets. The other printings with a release date run from 1999 to 2026. The earliest other card is Zapdos 16/102 in Base (1999). That card is named Zapdos, while this one is Rocket's Zapdos. That card lists 90 HP, and this one lists 70 HP. Both list the rarity Rare Holo. Ken Sugimori illustrated that card, and Shin-ichi Yoshida illustrated this one. Retreat cost there is 3, and here it is 2. 47 other cards of Zapdos list a different HP.
The attack Plasma lists 20 damage. The cost is Lightning. If there are any Lightning Energy cards in your discard pile, attach 1 of them to Rocket's Zapdos. Electroburn is another attack lists 70 damage. The cost is Lightning, Lightning, Lightning, Colorless. Rocket's Zapdos does damage to itself equal to 10 times the number of Lightning Energy cards attached to it. Resistance is Fighting -30. Retreat cost is 2.
I keep a set binder for Gym Challenge, meant to hold every card of that set. This card is one slot in the Gym Challenge set binder. A generation binder holds one card of each species. Zapdos can fill a slot in Generation 1 binder (Kanto). Themed lists that include this exact card are Trainer's Pokémon, Team Rocket cards, and Legendary birds. I still need this card.
If there are any Lightning Energy cards in your discard pile, attach 1 of them to Rocket's Zapdos.
Rocket's Zapdos does damage to itself equal to 10 times the number of Lightning Energy cards attached to it.
Gym Challenge, in the Gym series. It was released on October 16, 2000. The printed size is 132.
15/132. It is entry 15 of 132 in this checklist.
Shin-ichi Yoshida. The catalog lists 50 other cards with that illustrator.
Rare Holo.
Zapdos #145, generation 1 (Kanto).
Plasma (20) and Electroburn (70).