Don't really see how Gira-O can be balanced for the tier; it singlehandedly checks Lando-I, Mega Charizard Y, Serperior, Keldeo, Landorus-T, Mega Manectric, Manaphy, Mega Gallade and the list goes on. It has crazy power with Griseous Orb-boosted Draco Meteor and Shadow Sneak for priority, as well as fillers like Will-O-Wisp to cripple potential switch-ins such as Azumarill maybe. It also provides utility with spinblocking as well as Defogging. Its STAB combo hits the entire tier aside from like Bisharp (which is crippled by WoW) neutrally and its 150/100/100 bulk is just way too ridiculous to break. I have a hard time imagining how Gira-O can be balanced and introducing a broken mon to check another (potentially broken) mon is fallacious (for those supporting the cause for said reason). "