For the third time: New Sets! Yay!
Dragapult+Greninja

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(I am using greninja-ash to show the battle bond ability)
This is a very fast mon combined with a fast mon, which means tons of speed! There is also a lot o attack and special attack with this and it can have the ability Battle Bond. There could be a banded set with Dragon Darts (powerful stab+ breaks through sashes), Shadow ball (special due to Dragapult not having a good physical stab), U-turn (Momentum and killing darks yay!), and Psychic fangs (Fighting types and poison types: Beware.)
One final hurrah for Haxorus
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Yes, this combo lacks in speed, but nothing that can be rectified after a Dragon Dance. Having Haxorus means more speed and slightly more attack, while having Baxcalibur means having priority and a second STAB.
Moves+Set
Baxcalibur
You can run Life Orb+Sheer Force, with Dragon Claw/Outrage (Outrage is more powerful, but dragon claw doesn't lock you in), Icicle Crash (flinch chance turns into pure power), Icicle Spear (nICE priority), and Iron Head/Earthquake/Dragon Dance, depending if fairies or steels are more of a problem, OR if you want more power (somehow) or speed (makes sense).
Haxorus
Dragon claw or outrage, dragon dance, Iron Head, and either First Impression for the immediate priority or Night Slash.
Jumping through Hoops
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Volt absorb is a neat ability for you to switch in, although it has less power than the Adaptability set above. You could run a scarf set with special moves like Psyshock for Blissey, Shadow Ball, Dark Pulse, and Focus miss blast. I recommend a speed raising nature since this is pretty slow in Fusion standards. You could also change Tornadus-T with Iron Moth for marginally more speed but less power and losing Volt Absorb.