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If the holder uses a damage-dealing Steel-type move, then the holder consumes this item and the power of that move is increased by 50%. One-time use.
In single battles, Steel Gem is not typically a useful item, unfortunately. While the one-time boost to Steel-type attacks is nice, most Pokemon using Steel-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 Steel Gem is often used here to boost the power of Steel-type attacks such as Meteor Mash from Pokemon such as Metagross, as well as vastly increasing the power of Bullet Punch from Scizor or Metagross. The one-time power boost can come in very useful in such a fast-paced metagame, especially as it comes without any drawbacks.
Occur randomly in Dust Clouds.