Well, as Gen V is on the brink of being announced and released, soon Gen IV will come to an end and theorymon of unparalleled proportion shall commence. In the mean time, for nostalgia's sake (:P), I've created my last Gen IV team.
This is not the first team I've made, but the first I've had rated on Smogon.
This team is centered around a semi-stall method of wearing down switch in's via toxic spikes and stealth rock, while maintaining momentum and sweeping capability via Scarfgon, DDTar and Bulky SD Scizor. I'm not much for doubling OP length by posting a novel about how I built my team.
I've considered replacing DDTar with something along the lines of Mixmence, because DDTar sometimes falls flat on it's face. Any suggestions would be greatly appreciated.
Changes in Red.
Flygon @ Choice Scarf
Nature: Jolly
4 HP/252 Attack/252 Speed
Outrage
Earthquake
U-Turn
Fire Blast/Stone Edge
My very capable Anti-Lead. Thouroughly decimates Azelf and Aerodactyl, though I'm considering running Stone Edge so I don't have to be locked into Outrage while Scizor switches in. U-Turn enables it to escape from a problematic lead while also doing damage. Fire Blast can combat Bronzong, Metagross and Skarmory though I usually just U-Turn out for the first two. Jirachi is 2HKO'd, and because I outspeed, flinchax fails. Infernape, and all Sleeper leads are non-issues as I u-turn out safely.
As an added bonus, Flygon can come in later in the match and revenge kill sweepers such as neutral nature DDMence, and with U-Turn it can scout for opponent's Pokemon.
List of Common Leads:
Azelf: Outrage
Aerodactyl: Outrage, could be problematic if for some reason it had Ice Fang.
Breloom: U-Turn out, usually to Tentacruel or Blissey.
Flygon: pray it's not Jolly and either Outrage or U-Turn.
Gliscor: U-Turn to Tentacruel.
Heatran: 2HKO's ShucaTran, and OHKO's Specs/Scarftran.
Hippowdon: U-Turn to Rotom.
Infernape: Earthquake for the 2HKO.
Jirachi: Scarfrachi is 2HKOd.
Machamp: I rear back in sheer terror and U-Turn to Rotom.
Mamoswine: Flygon drops a load and GTFO.
Roserade: See Breloom.
Starmie: If it's LO, I U-turn to Tentacruel or Blissey. If Scarfed, I shrivel and die and bring out Blissey.
Tyranitar: U-Turn to Scizor and it becomes Set up bait.
Tentacruel @ Black Sludge
Nature: Calm
Liquid Ooze
252 HP/ 120 Defense/ 136 Speed
Toxic Spikes
Rapid Spin
Sludge Bomb
Surf
Since Flygon fails to stop SR and Toxic Spikes at the beginning of the match I needed a rapid spinner, in addition to an ice resist. Tentacruel makes a safe U-Turn target and can set up Toxic Spikes on the switch, in addition to absorbing toxic spikes on my side. Rapid spin lets me eliminate entry hazards, while Sludge Bomb and Surf offer near flawless coverage.
Rotom-C @ Leftovers
Nature: Bold
252 HP/ 168 Defense/ 88 Speed
Thunderbolt
Shadow Ball
Leaf Storm
Reflect
I needed a spin blocker that also can counter lead Hippowdon and Swampert. Lo and Behold. Thunderbolt over Discharge because poison will already be statusing switch ins, Shadow Ball for STAB, and Leaf Storm for all around chaos. Will-O-Wisp can actually help against some levitators and steel types, but it can be useless if Toxic Spikes is on the field. If anyone has an alternate move that could be used in it's place I'd be interested. I've switched to Reflect because it gives some of my team extra bulk and can let DDtar net an extra DD sometimes, though loss of leftovers+sand stream is a minor issue.
Scizor @ Leftovers
Technician
Nature: Adamant
188 HP/ 252 Attack/ 60 Speed
Bullet Punch
Swords Dance
Roost
Brick Break
Scizor with a slight twist. Bullet Punch for priority and STAB. Brick Break helps me break screens. Swords Dance can boost my Attack on the switch, while Roost gives me extra bulk and can sometimes let me net a second or third SD boost.
Blissey @ Leftovers
Natural Cure
Nature: Calm
24 HP/ 252 Defense/ 232 Sp. Def
Heal Bell
Softboiled
Flamethrower
Stealth Rock
Dear fat bitch, I hate you with a passion but you are of use to me for now so I let you live. Having a cleric helps me against some stall teams, plus being able to negate sleep is incredibly useful. Heal Bell and Aromatherapy are analogous, Softboiled for recovery, Flamethrower prevents me from becoming Scizor bait, and Stealth Rock helps with general "strategery".
Tyranitar @ Babiri Berry
Nature: Jolly
4 HP/ 252 Attack/252 Speed
Dragon Dance
Crunch
Stone Edge
Fire Punch
This set can be quite a bit of fun if executed properly. The loss of power via Jolly is somewhat nullified by SR and Toxic Spikes, while allowing it to outspeed Starmie. Fire Punch let's me hit Scizor, either on the switch or when they try in vain to kill me with bullet punch. I may consider replacing this in favor of something else because Sandstorm only benifits it and nullifies half of my team's leftovers, though it can help end some weather conditions, and with a bit of prediction, can lead to a Scizor set up.
Well that's about it.
This is not the first team I've made, but the first I've had rated on Smogon.
This team is centered around a semi-stall method of wearing down switch in's via toxic spikes and stealth rock, while maintaining momentum and sweeping capability via Scarfgon, DDTar and Bulky SD Scizor. I'm not much for doubling OP length by posting a novel about how I built my team.
I've considered replacing DDTar with something along the lines of Mixmence, because DDTar sometimes falls flat on it's face. Any suggestions would be greatly appreciated.
Changes in Red.

Flygon @ Choice Scarf
Nature: Jolly
4 HP/252 Attack/252 Speed
Outrage
Earthquake
U-Turn
Fire Blast/Stone Edge
My very capable Anti-Lead. Thouroughly decimates Azelf and Aerodactyl, though I'm considering running Stone Edge so I don't have to be locked into Outrage while Scizor switches in. U-Turn enables it to escape from a problematic lead while also doing damage. Fire Blast can combat Bronzong, Metagross and Skarmory though I usually just U-Turn out for the first two. Jirachi is 2HKO'd, and because I outspeed, flinchax fails. Infernape, and all Sleeper leads are non-issues as I u-turn out safely.
As an added bonus, Flygon can come in later in the match and revenge kill sweepers such as neutral nature DDMence, and with U-Turn it can scout for opponent's Pokemon.
List of Common Leads:
Azelf: Outrage
Aerodactyl: Outrage, could be problematic if for some reason it had Ice Fang.
Breloom: U-Turn out, usually to Tentacruel or Blissey.
Flygon: pray it's not Jolly and either Outrage or U-Turn.
Gliscor: U-Turn to Tentacruel.
Heatran: 2HKO's ShucaTran, and OHKO's Specs/Scarftran.
Hippowdon: U-Turn to Rotom.
Infernape: Earthquake for the 2HKO.
Jirachi: Scarfrachi is 2HKOd.
Machamp: I rear back in sheer terror and U-Turn to Rotom.
Mamoswine: Flygon drops a load and GTFO.
Roserade: See Breloom.
Starmie: If it's LO, I U-turn to Tentacruel or Blissey. If Scarfed, I shrivel and die and bring out Blissey.
Tyranitar: U-Turn to Scizor and it becomes Set up bait.

Tentacruel @ Black Sludge
Nature: Calm
Liquid Ooze
252 HP/ 120 Defense/ 136 Speed
Toxic Spikes
Rapid Spin
Sludge Bomb
Surf
Since Flygon fails to stop SR and Toxic Spikes at the beginning of the match I needed a rapid spinner, in addition to an ice resist. Tentacruel makes a safe U-Turn target and can set up Toxic Spikes on the switch, in addition to absorbing toxic spikes on my side. Rapid spin lets me eliminate entry hazards, while Sludge Bomb and Surf offer near flawless coverage.

Rotom-C @ Leftovers
Nature: Bold
252 HP/ 168 Defense/ 88 Speed
Thunderbolt
Shadow Ball
Leaf Storm
Reflect
I needed a spin blocker that also can counter lead Hippowdon and Swampert. Lo and Behold. Thunderbolt over Discharge because poison will already be statusing switch ins, Shadow Ball for STAB, and Leaf Storm for all around chaos. Will-O-Wisp can actually help against some levitators and steel types, but it can be useless if Toxic Spikes is on the field. If anyone has an alternate move that could be used in it's place I'd be interested. I've switched to Reflect because it gives some of my team extra bulk and can let DDtar net an extra DD sometimes, though loss of leftovers+sand stream is a minor issue.

Scizor @ Leftovers
Technician
Nature: Adamant
188 HP/ 252 Attack/ 60 Speed
Bullet Punch
Swords Dance
Roost
Brick Break
Scizor with a slight twist. Bullet Punch for priority and STAB. Brick Break helps me break screens. Swords Dance can boost my Attack on the switch, while Roost gives me extra bulk and can sometimes let me net a second or third SD boost.

Blissey @ Leftovers
Natural Cure
Nature: Calm
24 HP/ 252 Defense/ 232 Sp. Def
Heal Bell
Softboiled
Flamethrower
Stealth Rock
Dear fat bitch, I hate you with a passion but you are of use to me for now so I let you live. Having a cleric helps me against some stall teams, plus being able to negate sleep is incredibly useful. Heal Bell and Aromatherapy are analogous, Softboiled for recovery, Flamethrower prevents me from becoming Scizor bait, and Stealth Rock helps with general "strategery".

Tyranitar @ Babiri Berry
Nature: Jolly
4 HP/ 252 Attack/252 Speed
Dragon Dance
Crunch
Stone Edge
Fire Punch
This set can be quite a bit of fun if executed properly. The loss of power via Jolly is somewhat nullified by SR and Toxic Spikes, while allowing it to outspeed Starmie. Fire Punch let's me hit Scizor, either on the switch or when they try in vain to kill me with bullet punch. I may consider replacing this in favor of something else because Sandstorm only benifits it and nullifies half of my team's leftovers, though it can help end some weather conditions, and with a bit of prediction, can lead to a Scizor set up.
Well that's about it.