Once again, I'm taking a stab at running a Sunny Day team. This time around, I've taken the advice from my previous OU RMT and used a lot more Pokémon capable of benefitting from the sun's effects. My Sun Warriors are capable of hitting many things a lot harder in nUU than they were in OU...the most notable absences being Heatran, Blissey, and Jirachi.
Without further ado, please, rate my team! Changes are in red.
Cotoon (Jumpluff) (M) @ Heat Rock
Ability: Chlorophyll
EVs: 252 HP/4 Def/252 Spd
Jolly nature (+Spd, -SAtk)
- Sleep Powder
- Sunny Day
- U-Turn
- Encore
My Sunny Day setup Pokémon. He can generally beat any other lead, encoring Ambipom's Fake Out, Sleeping Obamasnow and switching to someone else after laying down sun, and ignoring most other leads besides Froslass, in which case I switch to Porygon2. He usually doesn't last very long, tragically, being quite frail. He can set up Sunny Day multiple times on an unprepared opponent and cripple sneaky substitute users with Encore. U-Turn allows me a free switch once the setup is done, much more useful than Worry Seed.
Ice attacks are redirected to Porygon2/Lanturn/Typhlosion
Rock attacks are redirected to Porygon2/Tangrowth
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Froth Tops (Exeggutor) (M) @ Life Orb
Ability: Chlorophyll
EVs: 40 Def/216 Spd/252 SAtk
Rash nature (+SAtk, -SpDef)
- Solarbeam
- Explosion
- Hidden Power [Ground]
- Psychic
The shining sun of my other team returns for round two. This time around, I've found a much more reliable Pokémon to set up Sunny Day, freeing up a move slot for Psychic, which is actually usable in nUU. Hidden Power is Ground, also, to beat out many Fire Types which may otherwise prove too tough. Otherwise, the combination of Max SpAtk with Life Orb coming off of an attack with 180 power after STAB will rip through everything barring Chansey (who can be 3HKO'd, not that it usually happens.)
Fire attacks are redirected to Lanturn/Typhlosion
Bug attacks are redirected to Porygon2 (since Scyther is the only bug attacker I've seen)
Flying attacks are redirected to Lanturn
Other attack types are generally beaten in Sun.
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Vitreous (Porygon2) @ Leftovers
Ability: Trace
EVs: 252 HP/56 Def/200 SDef
Calm nature (+SDef, -Atk)
- Ice Beam
- Discharge
- Recover
- Sunny Day
Porygon2 is my seconary Sun setup, and is extremely resilient on both the physical side and the special side, eating up special attacks left and right. Recover is to help him shrug off otherwise punishing attackers such as Jynx and Ninetails. The D'charge/Beam combo is a classic setup for this Pokémon, but I'm not sure if there isn't a better setup for him in nUU.
Fighting attacks are redirected to Tangrowth
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SpaGHETTI! (Tangrowth) (M) @ Life Orb
Ability: Chlorophyll
EVs: 200 Atk/228 Spd/80 SAtk
Naughty nature (+Atk, -SDef)
- Power Whip
- Earthquake
- Hidden Power [Fire]
- Swords Dance
Tangrowth is amazing in Sun! Sadly, he wrecks my Gold/Silver theme, but he's too good to pass up on a Sunny Day team like this. He provides some much needed Physical attacking in the form of Power Whip and Earthquake, an attack combination only resisted by Flying and Bug types. Grass types and Bug types have a nasty surprise in the form of HP Fire...especially Abomasnow. Replaced Sleep Powder with Swords Dance and haven't looked back since, Tangrowth can actually sweep through a lot more now!
Fire attacks are redirected to Lanturn/Typhlosion
Ice attacks are redirected to Lanturn/Porygon2
Flying and Bug attacks are generally ignored
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Veruka (Typhlosion) (F) @ Choice Scarf
Ability: Blaze
EVs: 252 Spd/252 SAtk
Modest nature (+SAtk, -Atk)
- Eruption
- Fire Blast
- Solarbeam
- Focus Blast
Another returning soldier from my OU team, Scarfruption Typhlosion literally outspeeds anything and everything that isn't scarfed in nUU. SR is far less common, allowing Eruption to be used more liberally. Fire Blast is still a destructive force rivaling Solarbeam, Solarbeam KOs water-types, and Focus Blast still whales on Rock types.
Ground attacks are redirected to Exeggutor/Tangrowth/Jumpluff
Water attacks are redirected to basically anything, especially in sun
Rock attacks are redirected to Tangrowth/Porygon2
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Lanturn (M) @ Leftovers
Ability: Volt Absorb
EVs: 40 HP/80 Spd/136 SAtk/252 SDef
Calm nature (+SDef, -Atk)
- Surf
- Confuse Ray
- Thunderbolt
- Ice Beam
The most critical member of my team is also the most out-of-place. A water type on a Sunny Day team is literally a fish out of water. But without a Pokémon to take all the Fire and Ice attacks that inevitably come out in nUU, my team would be sunk. Lanturn's massive HP and SpDef allow him to be perfect for the job. He can come in on any Electric attack as well, most notably Thunder Wave, and Confuse Ray the enem back. The three attacks can hit anything effectively except for Steels, who generally don't like staying in on Lanturn anyway.
Ground attacks are redirected to Exeggutor/Tangrowth/Jumpluff
---
So, there is my team. Tell me what you think! And thanks for the improvements!
Without further ado, please, rate my team! Changes are in red.

Cotoon (Jumpluff) (M) @ Heat Rock
Ability: Chlorophyll
EVs: 252 HP/4 Def/252 Spd
Jolly nature (+Spd, -SAtk)
- Sleep Powder
- Sunny Day
- U-Turn
- Encore
My Sunny Day setup Pokémon. He can generally beat any other lead, encoring Ambipom's Fake Out, Sleeping Obamasnow and switching to someone else after laying down sun, and ignoring most other leads besides Froslass, in which case I switch to Porygon2. He usually doesn't last very long, tragically, being quite frail. He can set up Sunny Day multiple times on an unprepared opponent and cripple sneaky substitute users with Encore. U-Turn allows me a free switch once the setup is done, much more useful than Worry Seed.
Ice attacks are redirected to Porygon2/Lanturn/Typhlosion
Rock attacks are redirected to Porygon2/Tangrowth
---

Froth Tops (Exeggutor) (M) @ Life Orb
Ability: Chlorophyll
EVs: 40 Def/216 Spd/252 SAtk
Rash nature (+SAtk, -SpDef)
- Solarbeam
- Explosion
- Hidden Power [Ground]
- Psychic
The shining sun of my other team returns for round two. This time around, I've found a much more reliable Pokémon to set up Sunny Day, freeing up a move slot for Psychic, which is actually usable in nUU. Hidden Power is Ground, also, to beat out many Fire Types which may otherwise prove too tough. Otherwise, the combination of Max SpAtk with Life Orb coming off of an attack with 180 power after STAB will rip through everything barring Chansey (who can be 3HKO'd, not that it usually happens.)
Fire attacks are redirected to Lanturn/Typhlosion
Bug attacks are redirected to Porygon2 (since Scyther is the only bug attacker I've seen)
Flying attacks are redirected to Lanturn
Other attack types are generally beaten in Sun.
---

Vitreous (Porygon2) @ Leftovers
Ability: Trace
EVs: 252 HP/56 Def/200 SDef
Calm nature (+SDef, -Atk)
- Ice Beam
- Discharge
- Recover
- Sunny Day
Porygon2 is my seconary Sun setup, and is extremely resilient on both the physical side and the special side, eating up special attacks left and right. Recover is to help him shrug off otherwise punishing attackers such as Jynx and Ninetails. The D'charge/Beam combo is a classic setup for this Pokémon, but I'm not sure if there isn't a better setup for him in nUU.
Fighting attacks are redirected to Tangrowth
---

SpaGHETTI! (Tangrowth) (M) @ Life Orb
Ability: Chlorophyll
EVs: 200 Atk/228 Spd/80 SAtk
Naughty nature (+Atk, -SDef)
- Power Whip
- Earthquake
- Hidden Power [Fire]
- Swords Dance
Tangrowth is amazing in Sun! Sadly, he wrecks my Gold/Silver theme, but he's too good to pass up on a Sunny Day team like this. He provides some much needed Physical attacking in the form of Power Whip and Earthquake, an attack combination only resisted by Flying and Bug types. Grass types and Bug types have a nasty surprise in the form of HP Fire...especially Abomasnow. Replaced Sleep Powder with Swords Dance and haven't looked back since, Tangrowth can actually sweep through a lot more now!
Fire attacks are redirected to Lanturn/Typhlosion
Ice attacks are redirected to Lanturn/Porygon2
Flying and Bug attacks are generally ignored
---

Veruka (Typhlosion) (F) @ Choice Scarf
Ability: Blaze
EVs: 252 Spd/252 SAtk
Modest nature (+SAtk, -Atk)
- Eruption
- Fire Blast
- Solarbeam
- Focus Blast
Another returning soldier from my OU team, Scarfruption Typhlosion literally outspeeds anything and everything that isn't scarfed in nUU. SR is far less common, allowing Eruption to be used more liberally. Fire Blast is still a destructive force rivaling Solarbeam, Solarbeam KOs water-types, and Focus Blast still whales on Rock types.
Ground attacks are redirected to Exeggutor/Tangrowth/Jumpluff
Water attacks are redirected to basically anything, especially in sun
Rock attacks are redirected to Tangrowth/Porygon2
---

Lanturn (M) @ Leftovers
Ability: Volt Absorb
EVs: 40 HP/80 Spd/136 SAtk/252 SDef
Calm nature (+SDef, -Atk)
- Surf
- Confuse Ray
- Thunderbolt
- Ice Beam
The most critical member of my team is also the most out-of-place. A water type on a Sunny Day team is literally a fish out of water. But without a Pokémon to take all the Fire and Ice attacks that inevitably come out in nUU, my team would be sunk. Lanturn's massive HP and SpDef allow him to be perfect for the job. He can come in on any Electric attack as well, most notably Thunder Wave, and Confuse Ray the enem back. The three attacks can hit anything effectively except for Steels, who generally don't like staying in on Lanturn anyway.
Ground attacks are redirected to Exeggutor/Tangrowth/Jumpluff
---
So, there is my team. Tell me what you think! And thanks for the improvements!