@matrix @xianc78 The ability Sheer Force has a pretty hilarious bug which has been present since Black/White (2010) and never been fixed. The ability is supposed to power up moves that have a secondary effect (like burn chance, flinch chance, boosting stats, etc) but prevent that effect from happening. The bug is that, if the move has a secondary effect, it also prevents numerous other completely unrelated effects from triggering - it basically just stops processing any effects that would happen afterwards. This means things like item effects (eg Life Orb damaging the user, Red Card switching out the opponent) and numerous different abilities don't work if Sheer Force triggers, even though it's only supposed to remove the secondary effects of the move itself. This also only happens if the move actually has a secondary effect, so something with Sheer Force that's holding a Life Orb, for example, will take Life Orb damage if they use a move without secondary effects (eg Earthquake) but won't take Life Orb damage if they use a move with secondary effects (eg Flamethrower).

Life Orb Sheer Force is a pretty common strategy in competitive pokemon because of this bug, since Life Orb and Sheer Force both give huge boosts to an attack's power, and the Sheer Force bug removes Life Orb's downsides without actually removing its boosts. Despite how common it is, often being used in official tournaments since it's discovery over a decade ago, Gamefreak still hasn't fixed this bug - it's still present in the most recent games, aside from PLA which cut abilities and held items entirely.