Aurorus @ Leftovers
Ability: Snow Warning
EVs: 80 HP / 252 SAtk / 176 Spd
- Frost Breath
The only reason you should be using this guy is if you're building a lower tier Hail team. Why you would build a Hail team is beyond my knowledge, as you got nerfed to the point where Stallrein, which was the main incentive to Hail back in ye olde dayse of Snover NU, is no longer an invincible beast.
Two Frost Breaths outdamage a Hyper Beam, and don't leave your opponent with a free turn to play around with either. Frost Breath is just an incredible move this Gen, being technically a base 120 power attack with 90% accuracy that ignores stat boosts. You could make an argument for using Blizzard on this set, since it is 100% accurate at the cost of 10 less base power and isn't stopped by Shell/Battle Armor, but Calm Mind is fairly prevalent in NU, so I believe Frost Breath is the more useful options. Discharge gives you what is technically Boltbeam, although this one has a chance of paralyzing. Encore is a great move to use on slower Pokemon, as it provides you with free reign if you can pull it off. Aurorus doesn't have many other options besides Dual Screening, which while an option, I would not recommend since Dual Screening generally is a suicidal role, and other Pokemon pull it off better. Protect allows you to scout for unfriendly coverage attacks such as HP Fighting or Focus Blast, while also stacking Leftovers healing and Hail damage.
Aurorus is going to die anyways, since it has such horrible resists, such a bad defense stat, and a weakness to the most common attacking types. So offensive set it is. Take down some slower Pokemon. Speed is enough to outspeed a fair number of the common Torterra brands. Then rest in HP.