A Sunny Day team I've been using recently. It works very well, and I like it a lot! It seems all of the weaknesses have been taken care of, though Flygon may be just a bit of a problem, if it isn't choiced in some way. So tell me what you think!
Crobat @ Leftovers
Inner Focus
Jolly
216 spd, 150 SDef, 88 Def, 52 HP
-U-Turn
-Super Fang
-Roost
-Sunny Day
Very fast Sunny Day setup pokemon. Also, a very good switch in on ground, fighting, grass, poison attacks. Can hurt opposing steal types halfway with super fang, something that will be needed for this team, or it can just U-Turn out. Good crippler to have.
Jumpluff @ Leftovers
Chlorophyll
Jolly252 Spd, 252 SAtk, 4 SDef
-Encore
-Substitute
-Leech Seed
-HP Flying
This Poke is used to setup for my sweepers. With constant subbing and seeding, it can widdle down the opponents team, especially walls. Once it does its job, i can switch out to one of the sweepers and it's good game. I run Encore ofer Sleep Powder, because I think it could be more beneficial, and I have sleep powder on my Victreebel.
Blissey @ Leftovers
Natural Cure
Bold
252 HP, 252 Def, 4 SDef
-Flamethrower
-Wish
-Protect
-Thunder Wave
Wish Blissey. It sits there and owns every single special attack thrown at it. It works very well with its offsetting partner on this team, Bronzong. The only thing really different about this one is that it's going to get a boosted Flamethrower. I've seen a lot of Metagross switch-ins on Blissey, and Flamethrower really hurts them. I think this Pokemon brings the whole team together.
Houndoom @ Life Orb
Flash Fire
Timid
252 SAtk, 252 Spd
-Fire Blast/Overheat
-Dark Pulse
-Solar Beam
-Will-O-Wisp
Sweeper #1. The special sweeper of the team. Fire Blast/Overheat is really whichever I'm in the mood for. Solar Beam over HP Fighting, because of the sun. Solar Beam also works as a good counter to Ground and Water Pokemon, who seem to switch in on Houndoom a lot. After weighing all of the choices for the team specs sweeper, Houndoom just came out ahead in my mind. It may be frail, but that's why I have great walls!
Victreebel @ Life Orb
Chlorophyll
Adamant
252 Atk, 136 HP, 120 Spd
-Leaf Blade
-Sucker Punch
-Swords Dance
-Sleep Powder
Here's the Sleep Powder pokemon of the team. Put them to sleep, Swords Dance (bringing its atk near 700!!!), then leafblad the crap out of them. Sucker Punch for surprises on Metagross switch ins or ghosts. A lot more durable than Houndoom, and can make up for its weaknesses if it's taken out. The best physical sweeper I could find for the team, as it has Chlorophyll, and a pretty good movepool to go along with its really good attack.
Bronzong @ Heat Rock
Levitate
Relaxed
252 HP, 204 Def, 52 Atk
-Gyro Ball
-Sunny Day
-Stealth Rock
-Explosion
Works as a 2nd Sunny Day setter-upper (ya gotta have 2). Also gets up my rocks, and takes away the threat of ice attacks. Before I added this, Machamp could just ravage my team if it had Ice Punch. Its healthy def (350), makes it a great physical wall, and with the lowest possible speed, a STABBED Gyro Ball will be doing some considerable Damage. Levitate on this Poke adds to the already large Ground resistance. Though most Flygons carry a Fire attack, I can use this as a switch-in most of the time. Comes in on EQs and Outrages from it. To solve the fire weakness, I could switch to Houndoom and absorb it, and begin to sweep, since its Fire Blast would be very powerful afterward (assuming the Flygon was choiced).
Crobat @ Leftovers
Inner Focus
Jolly
216 spd, 150 SDef, 88 Def, 52 HP
-U-Turn
-Super Fang
-Roost
-Sunny Day
Very fast Sunny Day setup pokemon. Also, a very good switch in on ground, fighting, grass, poison attacks. Can hurt opposing steal types halfway with super fang, something that will be needed for this team, or it can just U-Turn out. Good crippler to have.

Jumpluff @ Leftovers
Chlorophyll
Jolly252 Spd, 252 SAtk, 4 SDef
-Encore
-Substitute
-Leech Seed
-HP Flying
This Poke is used to setup for my sweepers. With constant subbing and seeding, it can widdle down the opponents team, especially walls. Once it does its job, i can switch out to one of the sweepers and it's good game. I run Encore ofer Sleep Powder, because I think it could be more beneficial, and I have sleep powder on my Victreebel.

Blissey @ Leftovers
Natural Cure
Bold
252 HP, 252 Def, 4 SDef
-Flamethrower
-Wish
-Protect
-Thunder Wave
Wish Blissey. It sits there and owns every single special attack thrown at it. It works very well with its offsetting partner on this team, Bronzong. The only thing really different about this one is that it's going to get a boosted Flamethrower. I've seen a lot of Metagross switch-ins on Blissey, and Flamethrower really hurts them. I think this Pokemon brings the whole team together.

Houndoom @ Life Orb
Flash Fire
Timid
252 SAtk, 252 Spd
-Fire Blast/Overheat
-Dark Pulse
-Solar Beam
-Will-O-Wisp
Sweeper #1. The special sweeper of the team. Fire Blast/Overheat is really whichever I'm in the mood for. Solar Beam over HP Fighting, because of the sun. Solar Beam also works as a good counter to Ground and Water Pokemon, who seem to switch in on Houndoom a lot. After weighing all of the choices for the team specs sweeper, Houndoom just came out ahead in my mind. It may be frail, but that's why I have great walls!

Victreebel @ Life Orb
Chlorophyll
Adamant
252 Atk, 136 HP, 120 Spd
-Leaf Blade
-Sucker Punch
-Swords Dance
-Sleep Powder
Here's the Sleep Powder pokemon of the team. Put them to sleep, Swords Dance (bringing its atk near 700!!!), then leafblad the crap out of them. Sucker Punch for surprises on Metagross switch ins or ghosts. A lot more durable than Houndoom, and can make up for its weaknesses if it's taken out. The best physical sweeper I could find for the team, as it has Chlorophyll, and a pretty good movepool to go along with its really good attack.
Bronzong @ Heat Rock
Levitate
Relaxed
252 HP, 204 Def, 52 Atk
-Gyro Ball
-Sunny Day
-Stealth Rock
-Explosion
Works as a 2nd Sunny Day setter-upper (ya gotta have 2). Also gets up my rocks, and takes away the threat of ice attacks. Before I added this, Machamp could just ravage my team if it had Ice Punch. Its healthy def (350), makes it a great physical wall, and with the lowest possible speed, a STABBED Gyro Ball will be doing some considerable Damage. Levitate on this Poke adds to the already large Ground resistance. Though most Flygons carry a Fire attack, I can use this as a switch-in most of the time. Comes in on EQs and Outrages from it. To solve the fire weakness, I could switch to Houndoom and absorb it, and begin to sweep, since its Fire Blast would be very powerful afterward (assuming the Flygon was choiced).