What it does
Light Metal halves the holder's weight, which affects all weight-based damage calculations.
The moves involved: Low Kick and Grass Knot deal more damage to heavier targets; Heavy Slam and Heat Crash deal more damage the heavier the user is relative to the target. Scizor normally weighs 118 kg. Light Metal drops that to 59 kg.
Concrete effect: Low Kick hitting Scizor goes from 80 base power (100–199.9 kg bracket) down to 60 base power (50–99.9 kg bracket), about a 25% damage reduction from that specific move. Scizor's own Heavy Slam also weakens because it's now lighter. Both directions take a hit.
Who runs it
Scizor (0% usage): Scizor's go-to ability is Technician, which boosts moves with 60 base power or below by ×1.5. Bullet Punch (base 40) hits with an effective 60-power priority strike under Technician. That single interaction is a huge chunk of why Scizor is dangerous — strong priority, STAB, Technician-boosted.
Light Metal's payoff — slightly less Low Kick damage — doesn't come close to that. Low Kick isn't even the primary threat against Scizor; Fire-type moves are. And Light Metal does nothing about those. 0% usage is the correct answer.
How to use it
If you go Light Metal Scizor, the niche application is surviving Low Kick a little better. If the opponent doesn't know you dropped Technician and fires off a Low Kick read, you take 25% less from it.
That's the entire value proposition — and it evaporates against the far more common Fire-type coverage that actually threatens Scizor. You've given up the ability that makes Scizor's kit function, for marginal protection in a matchup that rarely comes up.
Tips & strategy
Weight brackets: Low Kick power scales as follows — under 20 kg: 20 power; 20–49.9 kg: 40; 50–99.9 kg: 60; 100–199.9 kg: 80; 200+ kg: 120. Scizor at 118 kg sits in the 80-power bracket; at 59 kg after Light Metal it drops to 60. That's a real damage reduction if Low Kick is what you're facing.
The honest comparison: Technician adds 50% damage to Bullet Punch and other sub-65 moves on every single hit. Light Metal saves a bit of HP only when the opponent uses Low Kick specifically. The trade is straightforward — you're giving up Scizor's core offensive identity for a narrow defensive adjustment that barely changes outcomes. There's almost no competitive scenario where this is correct.