Board Thread:Questions and Answers/@comment-9013340-20130603190727/@comment-5945589-20130609135912

Just to simplify the whole thing, calculate total boosts - total reductions and you'd get the  end effect.

Example: Total 50% boost, but total 25% reduction, end effect = 25% boost on base atk

Its already kinda unfair for def teams to handle the 15% leader boost, and that's without having to deal with your version of the attacker having an boost/reduction advantage by using their skills first.