Reflect reduces damage from Physical attacks by 50%, for 5 turns. Its effects apply to all Pokémon on the user's side of the field.
If the user is holding Light Clay when Reflect is used, its effects last for 8 turns.
The move Brick Break, when used against an Pokémon under Reflect's effect, will remove the screen before dealing damage. The ability Infiltrator bypasses the effects of Reflect.