Hey! I've been playing with this team for a while and have worked out a few kinks, but am still not getting the full results I want. The aim of the team is to stall as much as possible and then sweep them at the end. I have met moderate success (and pissed off many competitors), reaching about 1650 on Pokemon Showdown. I like the strategy and the mons, but want to improve it as much as possible. So without further ado, let's take a look!
~~~~~
Gimpy
Sableye@Leftovers | Prankster
Careful | 252 HP / 120 DEF / 136 SPD
Will-o-wisp
Recover
Taunt
Foul Play
I mainly use Gimpy to counter other leads as well as spinblocking and prevent sweepers from setting up. His typing and use of Foul Play have also been great for getting rid of psychic types and others that normally prove difficult while also preventing him from being completely crippled by taunt. He's also always been a personal favorite from Gen III And I'm happy to have found a use for him!
Barb
Ferrothorn@leftovers | Iron Barbs
Relaxed | 252 HP / 88 DEF / SPD 168
Leech Seed
Stealth Rock
Protect
Power Whip
Chose Leech Seed and Stealth Rock for some extra recovery and a more reliable entry hazard (I tried spikes, and it never worked as well). I chose power whip over gyro ball for the type coverage. Considering giving a little more speed, but I've been happy with the nature so far. I've considered using a Forrettress instead, but Barb has been great so far!
Scorpio
Gliscor@Toxic Orb | Poison Heal
Impish | 252 HP / 185 DEF / 72 SPE
Substitute
Protect
Earthquake
Toxic
This used to be a Volcorona and a Heatran, but I decided to give up coverage for more stalling and I haven't regretted it since! Scorpio has been amazing for the stalling aspect on the team, especially when I get rid of the water and ice types. I already have a Tentacruel with Toxic Spikes, but Toxic here has been a great "just in case" move. I'm also considering using this in a mono-ground team I'm working on.
Ursula
Tentacruel@Black Sludge | Rain Dish
Bold | 252 HP / 240 DEF / 16 SPE
Scald
Toxic Spikes
Protect
Rapid Spin
Another great defensive substitution. Ursula used to be a Jellicent, but I realized that Ursula's resistances were more useful than the Jellicent's immunities. I've been considering ditching Rain Dish for Liquid Ooze, but I honestly have no idea. Scald is more for burning Steel types than for damage, while Toxic Spikes gets just about everything else. Rapid Spin is just a great addition to the things that are already helpful. :)
Brutus
Terrakion@Choice Scarf | Justified
Jolly | 252 ATK / 252 SPE / 4 SPD
Close Combat
Stone Edge
X-Scissor
Rock Slide
Now we get to the sweepers! I normally don't use legendaries, but Brutus did everything I wanted a physical sweeper to do. I love the coverage and the power that comes with him. However, I wanted more speed, so I scarfed him up. And by god, has this been bad ass. I chose to use Rock Slide for the extra flinch hax and increased accuracy over Stone Edge.
Comet
Jolteon@Life Orb | Volt Absorb
Timid | 252 SPE / 252 SPA / 4 DEF
Thunderbolt
Hidden Power Ice
Shadow Ball
Volt Switch
...and my special sweeper. Comet's speed and coverage has made him invaluable and Volt Absorb allows for much easier switch-in. I have had Comet on my OU teams for as far back as I can remember and I can't think of any pokemon doing his job better, but I am open to suggestions.
~~~~~
And that's the team! If anyone can tell me how to take this team to the next level, I'd really appreciate it.
~~~~~

Gimpy
Sableye@Leftovers | Prankster
Careful | 252 HP / 120 DEF / 136 SPD
Will-o-wisp
Recover
Taunt
Foul Play
I mainly use Gimpy to counter other leads as well as spinblocking and prevent sweepers from setting up. His typing and use of Foul Play have also been great for getting rid of psychic types and others that normally prove difficult while also preventing him from being completely crippled by taunt. He's also always been a personal favorite from Gen III And I'm happy to have found a use for him!

Barb
Ferrothorn@leftovers | Iron Barbs
Relaxed | 252 HP / 88 DEF / SPD 168
Leech Seed
Stealth Rock
Protect
Power Whip
Chose Leech Seed and Stealth Rock for some extra recovery and a more reliable entry hazard (I tried spikes, and it never worked as well). I chose power whip over gyro ball for the type coverage. Considering giving a little more speed, but I've been happy with the nature so far. I've considered using a Forrettress instead, but Barb has been great so far!

Scorpio
Gliscor@Toxic Orb | Poison Heal
Impish | 252 HP / 185 DEF / 72 SPE
Substitute
Protect
Earthquake
Toxic
This used to be a Volcorona and a Heatran, but I decided to give up coverage for more stalling and I haven't regretted it since! Scorpio has been amazing for the stalling aspect on the team, especially when I get rid of the water and ice types. I already have a Tentacruel with Toxic Spikes, but Toxic here has been a great "just in case" move. I'm also considering using this in a mono-ground team I'm working on.

Ursula
Tentacruel@Black Sludge | Rain Dish
Bold | 252 HP / 240 DEF / 16 SPE
Scald
Toxic Spikes
Protect
Rapid Spin
Another great defensive substitution. Ursula used to be a Jellicent, but I realized that Ursula's resistances were more useful than the Jellicent's immunities. I've been considering ditching Rain Dish for Liquid Ooze, but I honestly have no idea. Scald is more for burning Steel types than for damage, while Toxic Spikes gets just about everything else. Rapid Spin is just a great addition to the things that are already helpful. :)

Brutus
Terrakion@Choice Scarf | Justified
Jolly | 252 ATK / 252 SPE / 4 SPD
Close Combat
Stone Edge
X-Scissor
Rock Slide
Now we get to the sweepers! I normally don't use legendaries, but Brutus did everything I wanted a physical sweeper to do. I love the coverage and the power that comes with him. However, I wanted more speed, so I scarfed him up. And by god, has this been bad ass. I chose to use Rock Slide for the extra flinch hax and increased accuracy over Stone Edge.

Comet
Jolteon@Life Orb | Volt Absorb
Timid | 252 SPE / 252 SPA / 4 DEF
Thunderbolt
Hidden Power Ice
Shadow Ball
Volt Switch
...and my special sweeper. Comet's speed and coverage has made him invaluable and Volt Absorb allows for much easier switch-in. I have had Comet on my OU teams for as far back as I can remember and I can't think of any pokemon doing his job better, but I am open to suggestions.
~~~~~
And that's the team! If anyone can tell me how to take this team to the next level, I'd really appreciate it.