AttackRemoval Pulse
If the Defending Pokémon has any Energy cards attached to it, flip a coin. If heads, choose 1 of those Energy cards and discard it.

Gym Heroes is a set in the Gym series. It was released on 14 August 2000. The printed size is 132, and the checklist is the same length. Lt. Surge's Magnemite is 50/132, in position 50 of 132 on this checklist. Before it is 49 Erika's Weepinbell, and after it is 51 Lt. Surge's Raticate. The listed rarity is Uncommon.
Lt. Surge's Magnemite is a Basic Lightning Pokémon with 30 HP. The card lists level 31. In the Pokédex this is Magnemite (#081), generation 1 (Kanto). The card lists Magneton, Magneton (#082) under evolves to.
Atsuko Nishida illustrated this card. The same name is on 408 other cards in the catalog.
Magnemite (#081) has 45 other cards in the catalog. Those other cards are in 35 sets. The other printings with a release date run from 1999 to 2025. The earliest other card is Magnemite 53/102 in Base (1999). That card is named Magnemite, while this one is Lt. Surge's Magnemite. That card lists 40 HP, and this one lists 30 HP. The rarity there is Common, and here it is Uncommon. Keiji Kinebuchi illustrated that card, and Atsuko Nishida illustrated this one. 45 other cards of Magnemite list a different HP.
The attack Removal Pulse lists 10 damage. The cost is Lightning. If the Defending Pokémon has any Energy cards attached to it, flip a coin. If heads, choose 1 of those Energy cards and discard it. Confusion Pulse is another attack lists 20 damage. The cost is Lightning, Lightning. Flip a coin. If heads, the Defending Pokémon is now Confused. Weakness is Fighting ×2.
I keep a set binder for Gym Heroes, meant to hold every card of that set. This card is one slot in the Gym Heroes set binder. A generation binder holds one card of each species. Magnemite can fill a slot in Generation 1 binder (Kanto). Themed lists that include this exact card are Trainer's Pokémon, Atsuko Nishida cards, early series, Kanto Gym Leaders and their Pokémon, Lt. Surge and his Pokémon, and Magnemite, Magneton, and Magnezone. I still need this card.
If the Defending Pokémon has any Energy cards attached to it, flip a coin. If heads, choose 1 of those Energy cards and discard it.
Flip a coin. If heads, the Defending Pokémon is now Confused.
Gym Heroes, in the Gym series. It was released on 14 August 2000. The printed size is 132.
50/132. It is entry 50 of 132 in this checklist.
Atsuko Nishida. The catalog lists 408 other cards with that illustrator.
Uncommon.
Magnemite #081, generation 1 (Kanto).
Removal Pulse (10) and Confusion Pulse (20).