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If the holder uses a damage-dealing Electric-type move, then the holder consumes this item and the power of that move is increased by 50%. One-time use.
In single battles, Electric Gem is not typically a useful item, unfortunately. While the one-time boost to Electric-type attacks is nice, most Pokemon using Electric-type attacks would rather have the more reliable power of Life Orb or Choice items.
Typically Gems are more valuable in the VGC and similar environments, and Electric Gem is often used here to boost the power of Electric-type attacks such as Thunderbolt from Pokemon such as Thundurus and Magnezone. The one-time power boost can come in very useful in such a fast-paced metagame, particularly against specially defensive Pokemon, such as Togekiss and Jellicent, without any drawbacks. In addition, it can be used to increase the power of a first-turn Discharge.
Occur randomly in Dust Clouds.