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The wielder takes no damage from allies in double and triple battles, even if the move is specifically targeted at the wielder.
Moves that damage teammates in double and triple battles are few and far between, but in the case of attacks that hit the entire field, such as Earthquake or Explosion, this can be a useful ability to have. Otherwise, there are better options for each Pokemon that obtains it. This ability should never be used in singles.
Found in Dream World