On the subject of the nearly perfect Fairy / Shadow ball (resisted by lol Pyrorar)...
Togekiss has Dazzling Gleam / Shadow Ball / Nasty Plot. I don't think Togekiss is fast enough to sweep with Nasty Plot... but a Sticky Web might change that. (Togekiss outspeeds -1 Weavile and -1 Alakazam and OHKO with Dazzling Gleam / Shadow Ball respectively). Togekiss probably has to run Aura Sphere and hope to get to +6 vs Blissey or Chansey though, so it isn't going to be a clean sweep. Nasty Plotted Air Slash hax with Sticky Web support seems like a good idea however...
Flying/Ground seems good on paper, but it looks like practice will be different. Walled by Rock / Flying, Steel / Flying (Ugggh. Skarm), and Electric / Flying, as well as Levitators like Bronzong and Rotom-W. Nonetheless, it seems like a potent threat by Swords Dance Gliscor. Anyone have experience running Acrobat / Earthquake ?
For the Flying/Ground thing, you could pair that with a Gravity user (Landorus-T used it quite well, Mew, Jirachi and Magnezone could also setup Gravity then U-turn/Volt Switch out if needed to), unfortunately, that leaves you with two Pokemon with identical typings.. and only 4 turns (switching out), 3 turns if you plan to set up an SD, maybe 2 if you use a Sub or Roost for attacks.. but tbh, you don't really need that against Thundurus or Aerodactyl..
(w/ Gravity on)
+2 252+ Atk Flying Gem Gliscor Acrobatics (110 BP) vs. 128 HP / 0 Def Thundurus-T: 96.07 - 113.29%
+2 252+ Atk Flying Gem Gliscor Acrobatics (110 BP) vs. 0 HP / 4 Def Thundurus-T: 106.02 - 124.74%
+2 252+ Atk Gliscor Earthquake vs. 128 HP / 0 Def Thundurus-T: 233.83 - 275.52%
+2 252+ Atk Gliscor Earthquake vs. 224 HP / 252+ Def Skarmory: 100.91 - 119.26%
+2 252+ Atk Gliscor Earthquake vs. 224 HP / 32 Def Skarmory: 129.05 - 152.29%
+2 252+ Atk Flying Gem Gliscor Acrobatics (110 BP) vs. 0 HP / 0- Def Aerodactyl: 124.91 - 147.17%
+2 252+ Atk Gliscor Earthquake vs. 0 HP / 0- Def Aerodactyl: 303.65 - 357.47%
What's more important to keep in mind is ensuring rocks are up, if Dragonite's Multiscale is broken, you can OHKO after an SD + Flying Gem with Acrobatics. As long as Gravity is up, it should be okay, Thundurus can outspeed you though, so you have to watch out for that..
Hmm.. with Fairy/Ghost being nearly unresisted.. Specs/LO Sylveon could tear some holes through some teams @.@