Player2 on 27 October 2013
Going mega gives Lucario an useful ability (his other abilities are just meh) on top of the stat boosts, so I think mega is the best option in this case.
Not sure about Blaziken, he can have speed boost without it.
Since you mentioned Life Orb, it was broken last gen when paired with Sheer Force, because Sheer Force cancelled the recoil damage of Life Orb. Not sure if it still works.
But tbone or Lestat should know better.
