Man, Volcarona, Tyranitar, Bisharp, Heatran, Ferrothorn, Gengar and Terrakion all really get kinda shafted by this... poor unique-typed pokes...
Anyway, Swords Dance MegaZard X sounds really dangerous once faster threats have been eliminated. You could even go for a double dance set with it for both sweeping capability and wallbreaking power, since Dragon/Fire dual STAB gets such good coverage on its own... and remember that it also gets Sacred Fire if you prefer to use that over Flare Blitz (which would be great for burning things like Azumarill...)!
Hype for U-Turn Forretress! Garchomp gets U-Turn (via flygon), Dragon Dance and Extremespeed (both via Zygarde) too, making it an absolute powerhouse sweeper in the right hands! I would say Swords Dance + Extremespeed Flygon too, but quite frankly Garchomp outclasses it in every way. Sorry, Flygon.
Gunk Shot + Water Shuriken + Knock Off + Dragon Dance Crawdaunt could be a powerful Pokemon, courtesy of Greninja. Water Shuriken works especially well when you consider it is so slow and gets Adaptability STAB on the move! Sharpedo also gets these moves but it is way faster and weaker, so I like Crawdaunt for this more.
Fancy a Rapid Spin Steelix? How about an Excadrill with Stone Edge, or maybe one with Taunt?
Kyurem-Black FINALLY gets Fusion Flare! Sweet, right? No? Okay...
Every single pure Psychic type in the game, including (but not limited to) Alakazam, Gothitelle, Reuniclus, and Azelf, gets to use Mewtwo's signature Psystrike + Aura Sphere combo, as well as having access to Mew's vast movepool at their disposal. Alakazam will particularly love Psystrike and Aura Sphere (for sweeping and reliability respectively), while Gothitelle will be terrifying now it gets to use all of Mew's attacks and support options in conjunction with Shadow Tag.
There's loads of other awesome stuff too, but these caught my eye.