This Ability effect may be in need of research. Reason:How does it interact with Sticky Web in Double Battles? You can discuss this on the talk page.
Mirror Armor reflects the stat-lowering effects of moves and Abilities back to the user.
If multiple Pokémon, including the Pokémon with this Ability, would have their stats lowered by the same effect, only the stat drop that would have applied to the Pokémon with this Ability is reflected. If the Pokémon with this Ability is affected by Sticky Web, the effect is reflected back to the opponent.