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Whenever a super effective move is used on the wielder, the damage is decreased by 1/4. Basically, 2x effective attacks are treated as though they were 1.5x effective, and 4x effective attacks as if they were 3x effective.
Filter is a simple Solid Rock clone, although its limited distribution holds it back. With Filter, the user takes decreased damage from super effective attacks, meaning that Mr. Mime and Mime Jr. are a bit harder to take down than normal with moves such as Pursuit. Feel free to use Filter on one of Mr. Mime's offensive or Baton Pass sets if you dislike Technician or Soundproof, respectively.
Found in Dream World