Apparently, you did
Low Kick >>>>>>> Brick Break; there are so many heavy targets in OU that Brick Break is entirely unnecessary. Heck, Fighting moves aren't that necessary on Bisharp because Dark/Steel isn't resisted by much.
And X-Scissor is highly unnecessary on Mega Pinsir, as Aerilated Returns do more to Grass Pokemon and are already enough for Psychics and Darks. Mega Pinsir generally likes running Swords Dance because sometimes its initial power may not be enough to break through threats