Known that the team does not place Stealth Rock, which is a very important move in this metagame, especially against Pokemon like Volcarona, Dragonite, Salamence, Thundurus-T and others, then I would give Stealth Rock> Roar on Tyranitar.
Now I would change the set of Gliscor, because if you want to use it with Swords Dance, Fling makes little sense, much better to use Facade which is much more powerful, especially against Pokemon like Dragonite and Salamence which otherwise do not hit them when you are at full HP after a Swords Dance. but instead of Acrobatics, which is usually used together with Flyng Gem would use Taunt or Protect, Protect serves to recover HP exploiting Poison Heal + Toxic Orb, while Taunt to avoid the setup of different Wall.
To find the best Breloom Swords Dance> Low Sweep, which will increase the attack, making very dangerous especially Mach Punch, which is the priority, as well as Bullet Seed. Low Sweep would be convenient if after the attack did decrease the speed of the enemy, but otherwise move as you already Fight Mach Punch.
For Keldeo i suggest Hidden Power Ghost > Hidden Power Dark, so just hit Jellicent and Latios, but if you accidentally hit Terrakion, Lucario (with Justified) or Keldeo for example does not increase the attack.
Good luck, with your team!