AttackHigh Voltage
Flip a coin. If heads, your opponent can't play Trainer cards during his or her next turn.

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. Lt. Surge's Jolteon is 28/132, in position 28 of 132 on this checklist. Before it is 27 Koga's Pidgeotto, and after it is 29 Sabrina's Gengar. The listed rarity is Rare.
Lt. Surge's Jolteon is a Stage 1 Lightning Pokémon with 70 HP. The card lists level 32. In the Pokédex this is Jolteon (#135), generation 1 (Kanto). The card says it evolves from Lt. Surge's Eevee. In this catalog that name is Eevee (#133).
Ken Sugimori illustrated this card. The same name is on 1,112 other cards in the catalog.
Jolteon (#135) has 38 other cards in the catalog. Those other cards are in 28 sets. The other printings with a release date run from 1999 to 2025. The earliest other card is Jolteon 4/64 in Jungle (1999). That card is named Jolteon, while this one is Lt. Surge's Jolteon. Both list 70 HP. The rarity there is Rare Holo, and here it is Rare. Kagemaru Himeno illustrated that card, and Ken Sugimori illustrated this one. 27 other cards of Jolteon list a different HP.
The attack High Voltage lists 20 damage. The cost is Lightning, Colorless. Flip a coin. If heads, your opponent can't play Trainer cards during his or her next turn. Thunder Flare is another attack lists 30+ damage. The cost is Lightning, Lightning, Lightning. Does 30 damage plus 10 damage times the number of damage counters on Lt. Surge's Jolteon, then flip a coin. If tails, Lt. Surge's Jolteon does 30 damage to itself. Weakness is Fighting ×2. Retreat cost is 1.
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. Jolteon can fill a slot in Generation 1 binder (Kanto). Themed lists that include this exact card are Eevee and the Eeveelutions, Trainer's Pokémon, Kanto Gym Leaders and their Pokémon, and Lt. Surge and his Pokémon. I still need this card.
Flip a coin. If heads, your opponent can't play Trainer cards during his or her next turn.
Does 30 damage plus 10 damage times the number of damage counters on Lt. Surge's Jolteon, then flip a coin. If tails, Lt. Surge's Jolteon does 30 damage to itself.
Gym Challenge, in the Gym series. It was released on October 16, 2000. The printed size is 132.
28/132. It is entry 28 of 132 in this checklist.
Ken Sugimori. The catalog lists 1,112 other cards with that illustrator.
Rare.
Jolteon #135, generation 1 (Kanto).
High Voltage (20) and Thunder Flare (30+).