another salamence sweep :DThe downside I see to moves like Z-Mirror Move is that in addition to a set-up turn, they end up costing you your item, too. Running Choice Band on Staraptor gives the equivalent of a +1 boost without requiring a setup turn, so going up to a +2 boost once per game at the cost of an item and a turn doesn't feel as significant - especially in Staraptor's case, where you rarely end up clicking anything other than Brave Bird. I'd be interested to see if anyone has good success with them, but mostly I'm skeptical.
Anyhow, I'd seen Aquadext hyping Flyinium-Z Salamence, but I decided to finally give it a shot myself. Built a quick dragspam team yesterday and...
...OK, yeah, the hype is real. In addition to the insanely strong Flying attack, this thing also benefits from the fact that Z-Crystals can't be knocked off, giving you setup opportunities against things like Krookodile that otherwise can't touch you. Here are a couple of replays from a tour this morning:
http://replay.pokemonshowdown.com/gen7pokebankou-490108093
http://replay.pokemonshowdown.com/gen7pokebankou-490109403
They aren't the best replays in the world, but in both instances the Z-Crystal definitely played a role (in the first, by easily OHKOing Decidueye, though I'm not sure what it would have done to me in return, and in the second by allowing me to set up on Krookodile without fear of Knock Off). I've done other test games in general, though, and it is pretty consistently good. Just don't set up until Mimikyu is busted, and watch out for things like Slowbro. The power of STAB Supersonic Skystrike is enough to break through any Fairies not named Diancie, so it doesn't need to rely on Iron Tail to beat them. More, it gives it a strong attack (stronger than Outrage) to get the damage train rolling, so you can use Dragon Claw as your main attack and stick to Supersonic Skystrike to break through bulkier Pokemon such as Suicune and Hippo.
EDIT: And one more for fun, since this one shows off the Z-Move's power a bit better: http://replay.pokemonshowdown.com/gen7pokebankou-490142874
http://replay.pokemonshowdown.com/gen7pokebankou-491399786