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When the wielder uses a move that is not very effective on its target, the damage is doubled.
Tinted Lens is a great ability, and it's a shame it is only limited at the moment to some quite shockingly bad Pokemon. The main users at the moment in OU are Yanmega and Venomoth, both Bug-types, but neither really able to make a lasting impression in that tier. Both of these are monstrous threats in the lower tiers, but in the OU metagame, Tinted Lens is an ability you very rarely see.
Found in Dream World