THERE IS NO FLYING GEM IN GEN VI.
Hawlucha @ Power Herb
EVs: 252 HP / 252 Atk / 4 SpD
- Drain Punch / Iron Head / X-Scissor
- Rock Slide
Dig activates the Power Herb, therefore activating Unburden and making it faster than any unboosted Pokémon in the game (without any EVs or nature). It will not make Hawlucha vulnerable to Ground-type attacks like Earthquake, so using it without the Power Herb is essentially a non-priority but very fast Protect, followed by the attack. It also covers Hawlucha's Electric weakness.
Acrobatics, as on every single other set here, makes use of the now-empty item slot to get a 110 base power STAB Flying-type move, with 100% accuracy.
Rock Slide covers weakness to Ice-types and Flying-types, and hits both opponents in doubles.
Drain Punch is for STAB recovery, and also hits Ice-types. Iron Head covers Ice- and Fairy-types. X-Scissor covers Psychic-types. You can also use U-turn here, but be aware that once you switch out, your Speed boost from Unburden is gone forever. I recommend Drain Punch here.