Well, this looks like a great team, and sorry JCM but I'm going to answer too :P there's a few issues with it but nothing that can't be sorted out... so let's get right in.
Dustox
The issue I have with Dustox is that it has base 50 special attack, so you're going to have to get in loads of boosts before you can even do anything, which is also very tricky due to his mediocre bulk. Really the only viable Quiver Dancer in NU is Butterfree, who has Sleep Powder to aid setting up, better Special Attack and Speed, and Tinted Lens to help her STAB moves have better coverage. By the way, Life Orb is better with Hidden Power and Leftovers is preferred with Substitute.
Butterfree (M) @ Life Orb / Leftovers
Trait: Tinted Lens
EVs: 252 SAtk / 4 SDef / 252 Spd
Timid Nature (+Spd, -Atk)
- Sleep Powder
- Substitute / Hidden Power [Ground]
- Quiver Dance
- Bug Buzz
Beheeyem
I'm not really sure what you're trying to do with this guy. If you want him to be a defensive Calm Mind set, Musharna is definitely the way to go. However, Beheeyem has access to Trick Room and Nasty Plot, a combo popular in RU with Cofagrigus. And it's amazing. I'll give you both the sets:
Beheeyem (M) @ Life Orb / Leftovers
Trait: Synchronize
EVs: 252 HP / 4 Def / 252 SAtk
Quiet Nature (+SAtk, -Spd)
- Nasty Plot
- Trick Room
- Psychic
- Signal Beam
252 HP gives him enough bulk to take a couple of hits while he's setting up. Psychic is preferred STAB due to the prevalence of physical walls in NU, and Signal Beam hits Dark and Psychic types for super effective damage. You can go Leftovers for more bulk, but Life Orb is usually better to hit hard right off the bat in case you don't have time to Nasty Plot.
Musharna (F) @ Leftovers
Trait: Synchronize
EVs: 252 HP / 240 Def / 16 Spd
Bold Nature (+Def, -Atk)
- Calm Mind
- Psychic
- Signal Beam
- Moonlight
Number 1 counter to Sawk and Gurdurr in NU, this Pokemon is a baws. The HP and defense investment let it tank any physical hit easily while it sets up Calm Minds. Psychic and Signal beam again, for the best coverage. Moonlight is reliable recovery, and 16 Speed EVs allow it to outpace minimum speed Amoonguss and kill it before it puts you to sleep.
Mawile
Nice to see this Pokemon being used again, it's criminally underestimated imo. Anyway I don't know what you're doing with Swords Dance, you won't be killing anything with next to no attack investment and a single STAB move resisted by half the tier. So Pain Split is probably the best option for semi-reliable recovery. I'd also just go 252 HP / 252 Def / 4 Atk.
Emboar
CB Emboar is TOO STRONG. ahem well this looks like a good set, except you really ought to put Superpower instead of Earthquake because it gets STAB and covers the same things. Also, run 128 HP / 252 Atk / 128 Spd at least, to outpace most defensive Pokemon.
Gorebyss
Well as Riles said, smashpass is banned in RU and below, and Focus Sash won't do you much good unless you have a spinner. So White Herb over Focus Sash, Hidden Power [Grass] over Baton Pass, and Timid over Modest to outpace the omnipresent Scarfed Sawk & Pinsir. I also think Surf is better than Hydro Pump for the reliability, the only things you won't be OHKOing are special walls and they can't really do anything to you.
Miltank
Thick Fat over Sap Sipper definitely, to take Fire attacks for Mawile. Miltank works better as a special wall anyway, so 252 HP / 4 Atk / 252 SDef is the way to go. Cursetank is really bad... You already have Stealth Rock on Mawile, so you can replace Curse with a status move of your choice, Thunder Wave or Toxic. I'd say Thunder Wave as the paralysis support helps out your Emboar a lot, but it might get in the way of Beheeyem's Trick Room antics. It's up to you to decide really.
