Expedition Base Set is a set in the E-Card series. It was released on 15 September 2002. The printed size is 165, and the checklist is the same length. Metal Energy is 159/165, in position 159 of 165 on this checklist. Before it is 158 Darkness Energy, and after it is 160 Fighting Energy. The listed rarity is Rare.
Metal Energy is an Energy card. It is listed as Special.
Milky Isobe illustrated this card. The same name is on 22 other cards in the catalog.
The card text says: Damage done by attacks to the Pokémon Metal Energy is attached to is reduced by 10 (after applying Weakness and Resistance). If the Pokémon Metal Energy is attached to isn't Metal, whenever it damages a Pokémon by an attack, reduce that damage by 10 (after applying Weakness and Resistance). Metal Energy provides Metal Energy. (Doesn't count as a basic Energy card.)
I keep a set binder for Expedition Base Set, meant to hold every card of that set. This card is one slot in the Expedition Base Set set binder. I still need this card.