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When the wielder uses an attack with a secondary effect, the power of that attack is multiplied by 5325/4096 (about 130%) and the secondary effect is ignored. Recoil, user stat penalties, increased critical hit ratio, perfect accuracy, and variable-power attacks are primary effects and so moves with these effects are not boosted by Sheer Force. Moves with both a primary and secondary effect (such as Flare Blitz) will still gain the power increase, but the secondary ability is negated and the primary ability still takes place (in the case of Flare Blitz, the 10% burn rate is negated, but the user still takes recoil from increased power).
Sheer Force has a load of strange side-effects and interesting quirks. For example, Meloetta cannot transform with Relic Song if it has Sheer Force (via an ability-changing effect, such as Skill Swap). Sheer Force also negates the effects of items that occur after damage, such as Red Card or Eject Button on the defending Pokemon, and Shell Bell or Life Orb recoil on the attacking Pokemon, so long as the attack used has a secondary effect. It also negates the effects of the ability Color Change on the defending Pokemon, so long as the attack used has a secondary effect.
The negation of Life Orb recoil has turned Sheer Force into a destructive ability. Boosting common moves such as Flamethrower, Ice Beam, Thunderbolt, Fire Blast, Crunch, Earth Power, Focus Blast, Sludge Wave, and Waterfall, Sheer Force can turn previously unimpressive Pokemon into powerhouse sweepers. Nidoking has a wide movepool and Rampardos has sky-high Attack, just to give some examples of what can use Sheer Force effectively.
Found in Dream World