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If the wielder attacks and the target's ability would prevent the effects of the attack from taking place, or hinder the effects of the move, the ability is temporarily nullified while the attack is in progress. Abilities that prevent status, such as Limber or Magma Armor, are also deactivated during the attack. This allows a Pokemon that has one to be affected by the status they prevent, but the ability will cure the status immediately after all effects of the attack resolve. Mold Breaker also gives a message when the wielder switches in stating that it has Mold Breaker. Mold Breaker does not nullify abilities for the duration of either Future Sight or Doom Desire that was used by another Pokemon.
Abilities that are ignored are as follows:
Mold Breaker is awesome, because a lot of Pokemon are heavily dependent on their abilities, such as Bronzong. Haxorus is by far the best user of it, allowing it to narrow its counters down to a very small number of Pokemon. Mold Breaker is great against Pokemon using Levitate, as it allows Earthquake to be used against them as a method to bring them down. Pokemon such as Pinsir can also use Mold Breaker to negate Magic Bounce, allowing it to set up Stealth Rock without trouble.
Found in Dream World