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For five turns, damage from physical attacks is reduced to 1/2. In 2v2, it is reduced to 2/3, and the effect is extended to both Pokémon. The effect remains even if the user switches out. A critical hit ignores the protection. If the user is holding the item Light Clay, the move lasts for 8 turns instead. If the user or its partner is hit by the move Brick Break, Reflect immediately ends.
Light Screen is an equivalent move, but reduces special attack damage instead of physical.