I'd like an ability that works similarly to Mold Breaker, but instead of "ignor[ing] the effects of abilities that could potentially affect the damage or effects of a move that its user executes", would be "ignoring the effects of abilities that could potentially affect the damage or effects of a move that the opponent executes".
So basically, if a Pokemon with Sheer Force were to use a move with a secondary effect against a Pokemon with this ability, it wouldn't receive the 30% damage boost but the secondary effect would be back. Or if Shaymin-Sky were to use air slash on such a Pokémon, it would only have a 30% chance to flinch since Serene Grace wouldn't activate.