This is a team I've had for a while, but with some new strategies and movesets going around, I decided to finally get it rated. I've tried making other teams in the past, but none have been as good.
Gyarados @ Leftovers
Ability: Intimidate
EVs: 212HP / 16Atk / 180Def / 100Spd
Adamant nature (+ Atk - SpA)
--Dragon Dance
--Waterfall
--Earthquake
--Taunt
Your basic lead Gyarados, use taunt to mess up starters slower than him. Then after any threats to him are eliminated, DD and attempt to sweep.
Metagross @ Choice Band
Ability: Intimidate
EVs: 252HP / 232Atk / 16Def / 8Spd
Adamant nature (+ Atk - SpA)
--Explosion
--Meteor Mash
--Earthquake
--Pursuit
Ultimate Starmie killer, ultimately used to just do major damage with Earthquake or Meteor Mash and finish off with an Explosion.
Porygon2 @ Leftovers
Ability: Trace
EVs: 228HP / 136Def / 144SpA
Modest nature (+ SpA - Atk)
--Charge Beam
--Tri Attack
--Ice Beam
--Recover
My bulky special sweeper, use Charge Beam to raise Special Attack and sweep. Recover for hp regain and trace to use opponents abilities against them.
Tangrowth @ Leftovers
Ability: Chlorophyll
EVs: 252HP / 228Def / 28Spd
Modest nature (+ Def - SpA)
--Sleep Powder
--Power Whip
--Leech Seed
--Knock Off
Physical wall and ultimate annoyer. Knock Off to get rid of leftovers preventing Leech Seed to kill faster.
Heracross @ Choice Scarf
Ability: Guts
EVs: 104HP / 252Atk / 152Spd
Adamant nature (+ Atk - SpA)
--Close Combat
--Megahorn
--Stone Edge
--Night Slash
Basic CS Heracross.
Togekiss @ Leftovers
Ability: Serene Grace
EVs: 252HP / 4Def / 252SpD
Calm nature (+ SpD - Atk)
--Air Slash
--Nasty Plot
--Wish
--Baton Pass
My favorite member of the team. Nasty Plot, Wish, Baton Pass Support, or Flinch annoyer, anything slower than Togekiss has a rough time against it. It's also my Special Sponge.

Gyarados @ Leftovers
Ability: Intimidate
EVs: 212HP / 16Atk / 180Def / 100Spd
Adamant nature (+ Atk - SpA)
--Dragon Dance
--Waterfall
--Earthquake
--Taunt
Your basic lead Gyarados, use taunt to mess up starters slower than him. Then after any threats to him are eliminated, DD and attempt to sweep.

Metagross @ Choice Band
Ability: Intimidate
EVs: 252HP / 232Atk / 16Def / 8Spd
Adamant nature (+ Atk - SpA)
--Explosion
--Meteor Mash
--Earthquake
--Pursuit
Ultimate Starmie killer, ultimately used to just do major damage with Earthquake or Meteor Mash and finish off with an Explosion.

Porygon2 @ Leftovers
Ability: Trace
EVs: 228HP / 136Def / 144SpA
Modest nature (+ SpA - Atk)
--Charge Beam
--Tri Attack
--Ice Beam
--Recover
My bulky special sweeper, use Charge Beam to raise Special Attack and sweep. Recover for hp regain and trace to use opponents abilities against them.

Tangrowth @ Leftovers
Ability: Chlorophyll
EVs: 252HP / 228Def / 28Spd
Modest nature (+ Def - SpA)
--Sleep Powder
--Power Whip
--Leech Seed
--Knock Off
Physical wall and ultimate annoyer. Knock Off to get rid of leftovers preventing Leech Seed to kill faster.

Heracross @ Choice Scarf
Ability: Guts
EVs: 104HP / 252Atk / 152Spd
Adamant nature (+ Atk - SpA)
--Close Combat
--Megahorn
--Stone Edge
--Night Slash
Basic CS Heracross.

Togekiss @ Leftovers
Ability: Serene Grace
EVs: 252HP / 4Def / 252SpD
Calm nature (+ SpD - Atk)
--Air Slash
--Nasty Plot
--Wish
--Baton Pass
My favorite member of the team. Nasty Plot, Wish, Baton Pass Support, or Flinch annoyer, anything slower than Togekiss has a rough time against it. It's also my Special Sponge.