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I made a few changes that I think would be good for your team. When doing this, I loaded the team on PO and made changes accordingly. The team battled at total off 38 times. (sorrry, no time for any more) Changes made in bold)-

Beta (Metagross) @ Balloon
Trait: Clear Body
EVs: 252 HP / 252 Atk / 4 Spd
Adamant Nature (+Atk, -SAtk)
- Meteor Mash
- Hammer Arm
- Stealth Rock
- Bullet Punch

Meteor mash has higher base power than gyro ball because of gyro ball's relatively low base power in many of the slower leads. Hammer Arm is good, SR is because none of your teammates have entry hazzard support. Bullet punch is a must for picking of frail leads.

Mr. Pringles (Burungeru) (M) @ Leftovers
Trait: Cursed Body
EVs: 248 HP / 216 Def / 44 Spd
Bold Nature (+Def, -Atk)
- Boil Over
- Will-O-Wisp
- Recover
- Taunt

EVs are smogon because you don't have a physical wall. Smogon's EVs work better and allow the countering of annoying things such as excadrill.

Larry (Aakeosu) (M) @ Fight Jewel
Trait: Weak-kneed
EVs: 252 Atk / 4 SAtk / 252 Spd
Naive Nature (+Spd, -SDef)
- Acrobat
- Stone Edge
- Earthquake
- Hidden Power [Ice]

Aakekosu has week-kneed as a trait instead of defiant, which is honestly an awful ability. When at 50% life, the attack and special attack stats are halfed. Therefore, a choice scarf set would mean this would be switching in and out, something that this really can't afford to do. Rash isn't a good option because even two HP ices cannot 2hko Gliscor with no special attack investment. Naive allows a speed tie with gengar and friends, and is better that naughty. Acrobat is a great move, and this is Aakotsu's most used set for a reason.

Shine (Dragonite) (M) @ Leftovers
Trait: Multi-Scale
EVs: 252 HP / 152 SDef / 100 Spd
Adamant Nature (+Atk, -SAtk)
- Dragon Dance
- Roost
- Dragon Claw
- Fire Punch

Instead of a defensive set, I recommend a bulky sweeper set. Your team has no toxic spikes and many defensive pokemon, so a one bulky stallbreaker could shut the team down. Dragonite also has a much greater attack than special attack stat, and can function much better with this set.

Flora (Sazandora) (F) @ Choice Scarf
Trait: Levitate
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature (+Spd, -Atk)
- Draco Meteor
- Fire Blast
- U-turn
- Focus Blast

Choice scarf Hydregion replaced the vulture. I found that Mandibuzz really didn't have the bulk to set up multiple times, and was easilly walled by special walls, such as chansey. It doesn't have that much power, either. The speed stat was especially disappointing, as with a not-so-great speed stat and no boosted stats, this had trouble taking even unboosted hits and was 2hko'd by anything with reasonable STAB. Hydrregion suits its purpose well, and also, Mandibuzz shared a common weakness with electric, which none of your team members ressisted or was immune to.

Gloppy (Rankurusu) (M) @ Flame Orb
Trait: Magic Guard
EVs: 252 HP / 252 Def / 4 SAtk
Bold Nature (+Def, -Atk)
- Trick
- Calm Mind
- Psycho Shock
- Recover

This seemed to suit Reuniclus much better because of the frequent Scizors, Excas, and Tyranitars I met along the way. They couldn't do much damage burned, and with the primary counter gone, Gloppy was free to boost its special defense with calm mind and sweep with psycho shock (for all those blisseys out there.)

Overall - The typings I have now could change a little, as there is still a general weakness to ice and electric. Also, I've found that none of your team members truly like boosting sweepers, or skarm.