There's very little unifying element of this team, so forgive the lack of a clever title. In any case, I've been playing for not too long, have gone through some trial-and-error teams, and am pretty satisfied with how this is going. Nonetheless, I'd greatly appreciate some advice.
move 1: Swords Dance
move 2: Night Slash
move 3: Ice Shard
move 4: Low Kick
item: Focus Sash
nature: Jolly
evs: 4 HP / 252 Atk / 252 Speed
Weavile's my favorite Pokemon, so I'm always glad to put him on the team over another, even if the other could do its job slightly better. But so far, Weavile has proved itself in the field of combat well. I'll sometimes lead with it, either to set up an early sweep, pick off an opposing lead, or bait a weaker physical attack like U-turn into Ferrothorn. With one Swords Dance, Weavile OHKOs a lot of powerful Pokemon like Heatran and Tyranitar with Low Kick, rips away non-defensive neutral hits with Night Slash, and snipes frailer, faster opponents with Ice Shard. If the opponent's team has been weakened by residual damage or it's just near the end of the battle, Weavile can sweep everything. One big thing it has going for it is that people underestimate Weavile. It doesn't have a big name like Scizor or Haxorus, and people think their defensive walls can stand up to a lot more than they can.
move 1: Outrage
move 2: Earthquake
move 3: Fire Punch
move 4: Extremespeed
item: Choice Band
ability: Multiscale
nature: Adamant
evs: 4 HP / 252 Atk / 252 Spe
This is the other occasional lead. While Weavile sets up and sweeps, Dragonite appears on the battlefield and just punches a hole in everything. I try to predict a little, Fire Punching what I hope will be a Scizor or Genesect, and using Extremespeed when against a priority user (like a rival Weavile), but most of the time I just hit Outrage and hope for the best. Nothing is unscathed by Outrage. A rare few defensive dynamos can come back from it, but even Steels are pummeled by it. Couple that with Multiscale to keep it in the fight after at least one hit (since it too often goes second), and it's a pretty good "point and shoot" weapon.
Move 1: Stealth Rock
Move 2: Protect
Move 3: Leech Seed
Move 4: Gyro Ball
Nature: Relaxed
Item: Rocky Helmet
EVs: 252 HP, 168 Def, 88 Sp.Def
I like Ferrothorn because he's a mean wall. He doesn't just sit and take abuse, he punishes you for trying. If Scizor jumps in to Bullet Punch Weavile or an enemy Salamence wants to Outrage and no one else can withstand the assault, Ferrothorn not only shrugs off damage but knocks off about a quarter of their HP with every hit. Suddenly U-Turn jumpers aren't so safe. He sets up Stealth Rock reliably (and I found out that if a Spinner dies due to the Iron Barbs/Rocky Helmet recoil, hazards aren't spun away) and Leech Seed stalls out opposing walls while pumping his HP. Even with no attack power Gyro Ball hits pretty hard, especially against Rock types like Terrakion who want to set up.
Move 1: Wish
Move 2: Heal Bell
Move 3: Seismic Toss
Move 4: Toxic
Nature: Bold
Item: Eviolite
EVs: 252 HP, 252 Def, 4 Sp. Def.
My GOD can this girl take a hit. I mean, I couldn't believe it reading Latios' Draco Meteor doing a measly 20-some% off her health. Against anything that can't 2HKO, which is basically anything special based, she can Toxic and wait it out, take out an impressive chunk of HP with Seismic Toss, or heal my whole party. A wayward Will-o-Wisp or Thunder Wave won't take Dragonite or Gengar out of the match anymore. With her massive HP, Wish heals all my team to full HP, reactivating Dragonite's Multiscale and making Ferrothorn twice as annoying to take out. Her one main flaw is that healing herself is a little delayed, and often a surprising switch can take her out before she can recover.
Move 1: Substitute
Move 2: Disable
Move 3: Shadow Ball
Move 4: Focus Blast
Nature: Timid
Item: Leftovers
EVs: 4 HP, 252 Sp. Atk, 252 Speed
Initially you might think that a fast, frail attacker has too much overlap with Weavile, but Gengar fills in a very different niche. If anything, he's more of a staller, but packs a bigger punch. With a weird set of immunities that render him untouched by the primary attacks thrown at my two walls, he slips in and finds time to either set up a Substitute or outright KO the offender. Once the sub is up, they switch to something which probably has a strong Fighting/Ground move and a coverage move. The coverage move beats the Sub, they eat a Shadow Ball, and then they coverage again...only to find it Disabled. I set up Substitute again to rinse and repeat, or switch to Chansey to take advantage of the turns I have to heal up my party. This has been surprisingly effective in the past.
Move 1: Transform
Move 2:
Move 3:
Move 4:
Nature: Any
Item: Choice Scarf
EVs: 252 HP, 4 Atk, 252 Speed
This is my "if all else fails" lifesaver. This team has a lot of shortcomings, and Ditto can make up for that. If I've done a pretty good job whittling down their team with Stealth Rock, Leech Seed, Toxic, etc, but then a Volcarona or Salamence comes out and starts to set up, then instead of trying to sacrifice a Pokemon in countering it (Weavile with Ice Shard or Dragonite with Extremespeed), I often allow their sweeper to set up, KO my Pokemon, then go for the kill with Ditto. Using all of their setup and weather and what-have-you against them, it's not hard to sweep. Ditto's also good for utility, turning into a Rapid Spinner or Taunter to out-Taunt.
So there you have it. It's been serving me well, but I daresay there are things I could do to make it better. All suggestions welcome!

move 1: Swords Dance
move 2: Night Slash
move 3: Ice Shard
move 4: Low Kick
item: Focus Sash
nature: Jolly
evs: 4 HP / 252 Atk / 252 Speed
Weavile's my favorite Pokemon, so I'm always glad to put him on the team over another, even if the other could do its job slightly better. But so far, Weavile has proved itself in the field of combat well. I'll sometimes lead with it, either to set up an early sweep, pick off an opposing lead, or bait a weaker physical attack like U-turn into Ferrothorn. With one Swords Dance, Weavile OHKOs a lot of powerful Pokemon like Heatran and Tyranitar with Low Kick, rips away non-defensive neutral hits with Night Slash, and snipes frailer, faster opponents with Ice Shard. If the opponent's team has been weakened by residual damage or it's just near the end of the battle, Weavile can sweep everything. One big thing it has going for it is that people underestimate Weavile. It doesn't have a big name like Scizor or Haxorus, and people think their defensive walls can stand up to a lot more than they can.

move 1: Outrage
move 2: Earthquake
move 3: Fire Punch
move 4: Extremespeed
item: Choice Band
ability: Multiscale
nature: Adamant
evs: 4 HP / 252 Atk / 252 Spe
This is the other occasional lead. While Weavile sets up and sweeps, Dragonite appears on the battlefield and just punches a hole in everything. I try to predict a little, Fire Punching what I hope will be a Scizor or Genesect, and using Extremespeed when against a priority user (like a rival Weavile), but most of the time I just hit Outrage and hope for the best. Nothing is unscathed by Outrage. A rare few defensive dynamos can come back from it, but even Steels are pummeled by it. Couple that with Multiscale to keep it in the fight after at least one hit (since it too often goes second), and it's a pretty good "point and shoot" weapon.

Move 1: Stealth Rock
Move 2: Protect
Move 3: Leech Seed
Move 4: Gyro Ball
Nature: Relaxed
Item: Rocky Helmet
EVs: 252 HP, 168 Def, 88 Sp.Def
I like Ferrothorn because he's a mean wall. He doesn't just sit and take abuse, he punishes you for trying. If Scizor jumps in to Bullet Punch Weavile or an enemy Salamence wants to Outrage and no one else can withstand the assault, Ferrothorn not only shrugs off damage but knocks off about a quarter of their HP with every hit. Suddenly U-Turn jumpers aren't so safe. He sets up Stealth Rock reliably (and I found out that if a Spinner dies due to the Iron Barbs/Rocky Helmet recoil, hazards aren't spun away) and Leech Seed stalls out opposing walls while pumping his HP. Even with no attack power Gyro Ball hits pretty hard, especially against Rock types like Terrakion who want to set up.

Move 1: Wish
Move 2: Heal Bell
Move 3: Seismic Toss
Move 4: Toxic
Nature: Bold
Item: Eviolite
EVs: 252 HP, 252 Def, 4 Sp. Def.
My GOD can this girl take a hit. I mean, I couldn't believe it reading Latios' Draco Meteor doing a measly 20-some% off her health. Against anything that can't 2HKO, which is basically anything special based, she can Toxic and wait it out, take out an impressive chunk of HP with Seismic Toss, or heal my whole party. A wayward Will-o-Wisp or Thunder Wave won't take Dragonite or Gengar out of the match anymore. With her massive HP, Wish heals all my team to full HP, reactivating Dragonite's Multiscale and making Ferrothorn twice as annoying to take out. Her one main flaw is that healing herself is a little delayed, and often a surprising switch can take her out before she can recover.

Move 1: Substitute
Move 2: Disable
Move 3: Shadow Ball
Move 4: Focus Blast
Nature: Timid
Item: Leftovers
EVs: 4 HP, 252 Sp. Atk, 252 Speed
Initially you might think that a fast, frail attacker has too much overlap with Weavile, but Gengar fills in a very different niche. If anything, he's more of a staller, but packs a bigger punch. With a weird set of immunities that render him untouched by the primary attacks thrown at my two walls, he slips in and finds time to either set up a Substitute or outright KO the offender. Once the sub is up, they switch to something which probably has a strong Fighting/Ground move and a coverage move. The coverage move beats the Sub, they eat a Shadow Ball, and then they coverage again...only to find it Disabled. I set up Substitute again to rinse and repeat, or switch to Chansey to take advantage of the turns I have to heal up my party. This has been surprisingly effective in the past.

Move 1: Transform
Move 2:
Move 3:
Move 4:
Nature: Any
Item: Choice Scarf
EVs: 252 HP, 4 Atk, 252 Speed
This is my "if all else fails" lifesaver. This team has a lot of shortcomings, and Ditto can make up for that. If I've done a pretty good job whittling down their team with Stealth Rock, Leech Seed, Toxic, etc, but then a Volcarona or Salamence comes out and starts to set up, then instead of trying to sacrifice a Pokemon in countering it (Weavile with Ice Shard or Dragonite with Extremespeed), I often allow their sweeper to set up, KO my Pokemon, then go for the kill with Ditto. Using all of their setup and weather and what-have-you against them, it's not hard to sweep. Ditto's also good for utility, turning into a Rapid Spinner or Taunter to out-Taunt.
So there you have it. It's been serving me well, but I daresay there are things I could do to make it better. All suggestions welcome!