Hey, I'm new to smogon and competitive battling, so please feel free to change it all you want. I do have one pokemon that is not included in OU but I figured it would be all right. I will be using this in single battle random matchup in game and I will try to use it in double too, to see if it could be useful for an official pokemon tournament. Also, I was wondering whether you could use 2 pokemon with the same item in competitive play, because that would change things up. So here goes,
set 1:
Ninjask @ Leftovers
Ability: speed boost
Nature:impish
EVs: 248 HP/236 def/24 speed/
-protect
-substitute
-swords dance
-baton pass
I picked him for a good baton pass starter, and takes huge advantage of teams that don't attack right away, for then I can set up a few quick moves with substitute and swords dance, then a baton pass to metagross. Biggest problem is definitely being a taunt bait, for he has no attack moves. He also is extremely susceptible to stealth rock.
Metagross @ Life Orb / Choice Band
Ability: clear body
Nature: naive
EVs: 4 HP/252 Attack/252 Speed
-zen headbutt
-earthquake
-meteor mash
-toxic/telekinesis(to aid articuno)/take down/rock slide (please make a recommendation)
I picked him because he is an excellent sweeper, and can take most advantage of Ninjask's stat upgrades. with the speed boost upgrades and swords dance skyrocketing his already outstanding attack, he will be an insane sweeper, no matter if he's life orbed or choice banded.
Articuno @ Leftovers
Ability: pressure
Nature: impish
248 Hp/236 def/24 speed
-Mind Reader
-Sheer Cold
-rest
-ice beam
This pokemon I'm the most unsure about. he will be great for finishing off maybe that last Pokemon that Metagross may leave behind, with a mind reader sheer cold combo. However, I may benefit more from a rapid spinner, for my team has a huge weakness to stealth rock.
Set 2:
Bronzong @ Light Clay
Ability: heatproof
Nature: impish
EVs: 252 HP/152 Atk/8 Def/96 SpD
-Reflect
-light screen
-gyro ball
-earthquake
This pokemon will be great for setting up a good environment for my baton passer with reflect and light screen, either ninjask or venemoth. He can also serve as a tank for a while, with gyro ball and earthquake to take out opponents. However, I will be extremely susceptible to rain teams with this opener. This is another one I am unsure I should keep.
Venemoth @ Leftovers
Ability: tinted lens
Nature: bold
EVs: 252 HP/4 SpA/252 Spe
-Baton pass
-Quiver dance
-sleep powder
-bug buzz
Another great baton passer to use. with sleep powder to cripple opponents before setting up couple quiver dances then baton passing. Another one susceptible to stealth rock. quiver dance will be an extremely useful boost for the next pokemon....
Sigilyph @ Life Orb
Ability: Magic Guard
Nature: modest
EVs: 252 SpA/252 Speed/4 HP
-Stored power
-thunderbolt
-ice beam
-roost/calm mind/shadow ball/air slash
With stored power leading its moves, it can become extremely powerful with the quiver dances, as its special attack will be doubled and stored power will then do 140 damage. Along with thunderbolt and ice beam to deal with some weaknesses, he becomes an awesome special sweeper. However, I am unsure what to do with his last move.
Concluding thoughts: Some glaring weaknesses in this team is undoubtedly stealth rock, which could cripple many of my pokemon, and rain teams when I open with bronzong. The two that I would most like to get rid of are Articuno and Bronzong, as they don't bring a lot to the table, especially articuno, and I am in desperate need of a rapid spinner as it seems. Thank you for all of your suggestions! I will put any changes made at the bottom.
set 1:

Ninjask @ Leftovers
Ability: speed boost
Nature:impish
EVs: 248 HP/236 def/24 speed/
-protect
-substitute
-swords dance
-baton pass
I picked him for a good baton pass starter, and takes huge advantage of teams that don't attack right away, for then I can set up a few quick moves with substitute and swords dance, then a baton pass to metagross. Biggest problem is definitely being a taunt bait, for he has no attack moves. He also is extremely susceptible to stealth rock.

Metagross @ Life Orb / Choice Band
Ability: clear body
Nature: naive
EVs: 4 HP/252 Attack/252 Speed
-zen headbutt
-earthquake
-meteor mash
-toxic/telekinesis(to aid articuno)/take down/rock slide (please make a recommendation)
I picked him because he is an excellent sweeper, and can take most advantage of Ninjask's stat upgrades. with the speed boost upgrades and swords dance skyrocketing his already outstanding attack, he will be an insane sweeper, no matter if he's life orbed or choice banded.

Articuno @ Leftovers
Ability: pressure
Nature: impish
248 Hp/236 def/24 speed
-Mind Reader
-Sheer Cold
-rest
-ice beam
This pokemon I'm the most unsure about. he will be great for finishing off maybe that last Pokemon that Metagross may leave behind, with a mind reader sheer cold combo. However, I may benefit more from a rapid spinner, for my team has a huge weakness to stealth rock.
Set 2:

Bronzong @ Light Clay
Ability: heatproof
Nature: impish
EVs: 252 HP/152 Atk/8 Def/96 SpD
-Reflect
-light screen
-gyro ball
-earthquake
This pokemon will be great for setting up a good environment for my baton passer with reflect and light screen, either ninjask or venemoth. He can also serve as a tank for a while, with gyro ball and earthquake to take out opponents. However, I will be extremely susceptible to rain teams with this opener. This is another one I am unsure I should keep.

Venemoth @ Leftovers
Ability: tinted lens
Nature: bold
EVs: 252 HP/4 SpA/252 Spe
-Baton pass
-Quiver dance
-sleep powder
-bug buzz
Another great baton passer to use. with sleep powder to cripple opponents before setting up couple quiver dances then baton passing. Another one susceptible to stealth rock. quiver dance will be an extremely useful boost for the next pokemon....

Sigilyph @ Life Orb
Ability: Magic Guard
Nature: modest
EVs: 252 SpA/252 Speed/4 HP
-Stored power
-thunderbolt
-ice beam
-roost/calm mind/shadow ball/air slash
With stored power leading its moves, it can become extremely powerful with the quiver dances, as its special attack will be doubled and stored power will then do 140 damage. Along with thunderbolt and ice beam to deal with some weaknesses, he becomes an awesome special sweeper. However, I am unsure what to do with his last move.
Concluding thoughts: Some glaring weaknesses in this team is undoubtedly stealth rock, which could cripple many of my pokemon, and rain teams when I open with bronzong. The two that I would most like to get rid of are Articuno and Bronzong, as they don't bring a lot to the table, especially articuno, and I am in desperate need of a rapid spinner as it seems. Thank you for all of your suggestions! I will put any changes made at the bottom.