'd use a Gallade instead of Gardivoir with Ademant or Brave Nature with the moves Pychoe Cut, Swords Dance/Bulk Up(depends on if you want some more Defence), Close Clobat/Drain Punch(which ever tickles your peach) and Night Shade/Shadow Ball(personaly I'd use Shadow Claw because Gallade is i phyisical fighter). Although you won't have Gardivoir for Sp.Attacks you'll still have Gallade( who only has two main weaknesses: Flying and Ghost) to pack a punch after using Swords Dance/Bulk Up. What do you think?
mayya