What a great question, Mega-Roserade! Since no one has answered yet, I, a total stranger whom you probably know nothing about, will enlighten you on the mechanics of the wonderful ability who goes by the name of Sheer Force!
Effects that come along with attacking moves can be put into categories:
- Primary Effects, including recoil, stat penalty or status condition for the user, increased critical hit rate, moves that never miss, moves that change power and two-turn moves.
- Secondary Effects, including reducing the target's stats, increasing the user's stats, inflicting flinch on the target, or causing a status condition to the target.
Sheer Force only boosts moves with secondary effects and removes said effects- it will not boost moves with only primary effects, and will not remove said effects if boosting a move for another reason. For example, Flare Blitz inflicts recoil and has a chance to burn. It will have a 30% power increase and no chance to burn from Sheer Force, but the recoil stays as it is a primary effect.
This is a list of all moves which have a secondary effect. All of these moves will be boosted by Sheer Force and the effects listed will be negated.
Items and abilities will only be affected if a move has been used which is boosted by Sheer Force. It will no longer trigger item or ability effects that activate after attacking. Effects that take place before attacking, however, remain. This explains why the power increase from a Life Orb remains but the recoil is negated when using a move boosted by Sheer Force. Red Card, Eject Button, and Color Change are also affected.