Aurora Veil

Reduces damage 5 turns, but must be used during hail .

Aurora Veil reduces the damage done by Physical and Special category moves by 50% for 5 turns in Single Battle.
In other types of battle, Aurora Veil protects all ally Pokémon but only reduces the damage by ~33%.
Aurora Veil does not reduce the damage of:

• self-inflicted confusion damage
• critical hits
• moves that deal direct damage such as Bide

Aurora Veil can only be used during hail or snow but the effect remains even if the appropriate weather stopped.
Air Lock and Cloud Nine prevent the use of Aurora Veil.
Aurora Veil and Reflect do not stack.
Aurora Veil is removed from the field when:

• hit by Brick Break, Defog, Psychic Fangs or Raging Bull
• a Pokémon with the ability Screen Cleaner enters the field

Any Pokémon with the ability Infiltrator ignore Aurora Veil with their attacking moves.
Light Clay extends the duration of Aurora Veil to 8 turns.