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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. Teravolt also gives a message when the wielder switches in stating that it has Teravolt. Teravolt does not nullify abilities for either Future Sight or Doom Desire used by another Pokemon.
Abilities nullified are:
Zekrom could have a better ability, but offensively, it isn't a massive downfall. Being able to strike opponents such as Volt Absorb Lanturn with a STAB Bolt Strike is a powerful tool, and while Teravolt doesn't negate the ever-present Pressure in Ubers, it can be useful in taking down some other Pokemon present in Ubers, such as Forretress and Skarmory by negating Sturdy, Shedinja by negating Wonder Guard, and Lugia by negating Multiscale.
Found in Dream World