Here's my first try at a 5th gen team. This is a double team though I have used some of the pokemon in single battle and they have worked pretty well.
Tornadus @ Flying Gem
Ability: Prankster
EV's: 252Attack/6 Sp. Defense/252 Speed
Nature: Hasty
-Substitute
-Acrobatics
-Focus Blast
-Tailwind
This is my lead tailwind pokemon. Tornadus can tailwind both my Metagross or my Electrivire to allow them to sweep without either an Motor Drive boost or an Agility boost. Acrobatics and Focus Blast give it prettty good coverage while substitute gives it a way to shield from damage.
Gyarados @ Leftovers
Ability: Intimidate
EV's: 156 HP / 72 Attack / 96 Defense / 184 Speed
Nature: Adament
-Waterfall
-Stone Edge
-Taunt
-Dragon Dance
This is my Bulky DD Gyarados. This is one of my main sweepers and is bait for electrivire to come in for an free motor drive boost. Taunt lets me take care of pokemon that try to set up on me while Dragon Dance along with Stone Edge and Waterfall give me great coverage and damage.
Electrivire @ Expert Belt
Ability: Motor Drive
EV's: 6 Attack/ 252 Sp. Attack/ 252 Speed
Nature:Mild
-Thunderbolt
-Flamethrower
-Low Sweep
-Earthquake
This is my mixed electrivire who come sin most of the time ti finish off electric types and gain an motor Drive boost off of pokemon trying to kill Gyarados. Thunderbolt, Flamethrower, and Earthquake give me great coverage along with Super Effective damage on many different Types. I choose Low Sweep over Cross Chop this time because I thought that its ability to lower the opponents speed would help in this team.
Gliscor @ Yache Berry
Ability: Hyper Cutter
EV's: 252 HP / 184 Defense / 72 Speed
Nature: Impish
-Protect
-Toxic
-Earthquake
-Ice Fang
This is my Wall Gliscor. It mostly comes out to wall the physical threats of my 3 sweepers (gyarados, metagross, and electrivire). Since it takes no damage from electric type and ground ype along woth taking half damage from fire and rock damage it does a great job at walling and defeating the threats to my main sweepers. It set is a typical Gliscor set used to either get quick kills woth Earthquake and ice Fang or to slowly stall and kill enemies with a conjunction of Toxic and Ice Fang. At the moment I have not found a DW gligar but as soon as I find one I will probably use it with a similar set instead of this one.
Metagross @ Air Balloon
Ability: Clear Body
EV's: 6 HP/ 252 Attack/ 252 Speed
Nature: Naive
-Earthquake
-Zen Headbutt
-Meteor Mash
-Agility
This is the standard Agiligross. Simply put it either uses agility or gets a tailwind boost from Tornadus and attempts to sweep.
Golduck @ Wide Lens
Ability: Cloud Nine
EV's: 6 HP/ 252 Sp. Attack/ 252 Speed
Nature: Mild
-Hydro Pump
-Focus Blast
-Ice Beam/Blizzard
-Toxic/ Psych Up
This is the newest member of my team and a set of my own creation. Golduck is my weather set up check. Golduck is only used if I see in the team preview that they are using weather. I would send this out with most likely electrivire in order to stop the weather with Cloud Nine and to defeat the weather set up pokemon so that it cant set up anymore for its team. Hydro Pump is for Ninetales, Hippowdon and Tyranitar. Focus Blast is for Tyranitar and Abomasnow. Politoed is usually taken out by electrivire who is usually paired with golduck. Blizzard increases coverage whilst Psych Up allows Golduck to double as a stat up phazer and Toxic allows me to slowly kill an enemy (such as Politoed if it came to it). So far I have only had to use Golduck a couple of times but so far it has filled its niche perfectly.
Thank you for reading my team and I hope you give me plenty of suggestions of what I should change and make better. Here some things im not sure about that I would like opinions on how and what I could change. Tornadus is pretty good so far but who else do you think could benefit my team better. I have an Amoonguss and an Thundurus who both based on the sets I have looked at may work well in Tornadus's place. Metagross has done pretty well but it seems that it either cant find a good place to come in after it is switched out or it gets killed too early. I think its problem is its low speed so who do you think would be a good replacement for it. Last, I am really liking my Golduck set but what do you think should be changed or who do you think should replace him to better support my team.

Tornadus @ Flying Gem
Ability: Prankster
EV's: 252Attack/6 Sp. Defense/252 Speed
Nature: Hasty
-Substitute
-Acrobatics
-Focus Blast
-Tailwind
This is my lead tailwind pokemon. Tornadus can tailwind both my Metagross or my Electrivire to allow them to sweep without either an Motor Drive boost or an Agility boost. Acrobatics and Focus Blast give it prettty good coverage while substitute gives it a way to shield from damage.

Gyarados @ Leftovers
Ability: Intimidate
EV's: 156 HP / 72 Attack / 96 Defense / 184 Speed
Nature: Adament
-Waterfall
-Stone Edge
-Taunt
-Dragon Dance
This is my Bulky DD Gyarados. This is one of my main sweepers and is bait for electrivire to come in for an free motor drive boost. Taunt lets me take care of pokemon that try to set up on me while Dragon Dance along with Stone Edge and Waterfall give me great coverage and damage.

Electrivire @ Expert Belt
Ability: Motor Drive
EV's: 6 Attack/ 252 Sp. Attack/ 252 Speed
Nature:Mild
-Thunderbolt
-Flamethrower
-Low Sweep
-Earthquake
This is my mixed electrivire who come sin most of the time ti finish off electric types and gain an motor Drive boost off of pokemon trying to kill Gyarados. Thunderbolt, Flamethrower, and Earthquake give me great coverage along with Super Effective damage on many different Types. I choose Low Sweep over Cross Chop this time because I thought that its ability to lower the opponents speed would help in this team.

Gliscor @ Yache Berry
Ability: Hyper Cutter
EV's: 252 HP / 184 Defense / 72 Speed
Nature: Impish
-Protect
-Toxic
-Earthquake
-Ice Fang
This is my Wall Gliscor. It mostly comes out to wall the physical threats of my 3 sweepers (gyarados, metagross, and electrivire). Since it takes no damage from electric type and ground ype along woth taking half damage from fire and rock damage it does a great job at walling and defeating the threats to my main sweepers. It set is a typical Gliscor set used to either get quick kills woth Earthquake and ice Fang or to slowly stall and kill enemies with a conjunction of Toxic and Ice Fang. At the moment I have not found a DW gligar but as soon as I find one I will probably use it with a similar set instead of this one.

Metagross @ Air Balloon
Ability: Clear Body
EV's: 6 HP/ 252 Attack/ 252 Speed
Nature: Naive
-Earthquake
-Zen Headbutt
-Meteor Mash
-Agility
This is the standard Agiligross. Simply put it either uses agility or gets a tailwind boost from Tornadus and attempts to sweep.

Golduck @ Wide Lens
Ability: Cloud Nine
EV's: 6 HP/ 252 Sp. Attack/ 252 Speed
Nature: Mild
-Hydro Pump
-Focus Blast
-Ice Beam/Blizzard
-Toxic/ Psych Up
This is the newest member of my team and a set of my own creation. Golduck is my weather set up check. Golduck is only used if I see in the team preview that they are using weather. I would send this out with most likely electrivire in order to stop the weather with Cloud Nine and to defeat the weather set up pokemon so that it cant set up anymore for its team. Hydro Pump is for Ninetales, Hippowdon and Tyranitar. Focus Blast is for Tyranitar and Abomasnow. Politoed is usually taken out by electrivire who is usually paired with golduck. Blizzard increases coverage whilst Psych Up allows Golduck to double as a stat up phazer and Toxic allows me to slowly kill an enemy (such as Politoed if it came to it). So far I have only had to use Golduck a couple of times but so far it has filled its niche perfectly.
Thank you for reading my team and I hope you give me plenty of suggestions of what I should change and make better. Here some things im not sure about that I would like opinions on how and what I could change. Tornadus is pretty good so far but who else do you think could benefit my team better. I have an Amoonguss and an Thundurus who both based on the sets I have looked at may work well in Tornadus's place. Metagross has done pretty well but it seems that it either cant find a good place to come in after it is switched out or it gets killed too early. I think its problem is its low speed so who do you think would be a good replacement for it. Last, I am really liking my Golduck set but what do you think should be changed or who do you think should replace him to better support my team.