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Until the user is no longer active, all Electric-type attacks used by any active Pokemon have their power reduced to 0.33x. Fails if this move is already in effect. This effect is not stackable.
Mud Sport should not be used competitively. The majority of Pokemon with access to this move are immune to Electric-type attacks, and those that aren't would prefer switching to a teammate immune or resistant to Electric-type attacks to put pressure on the opponent.
Water Sport is a Water-type equivalent that affects Fire-type attacks.