I created this sun team to be offensive and to take down opposing weather summoners. I tested this team (Typo, first team) on PO and Smogon University, this team won 16-4 on PO and 7-1 on Smogon University. It has some Synergy and works well. Thanks for reading and rating.
Changes in Bold
1:Lead MienShao @ Life Orb
Ability: Regenerator
Evs: 252Atk/4SpA/252Spe
Nature:Naive
Moves:Fake Out
High Jump Kick
U-Turn
Hidden Power Dark
I changed to MienShao because it's good for taking out most leads as well weather summoners. It takes out T-tars with a Fake out and HJK and Politoeds(if not defensive set) and opposing Ninetails with Fake Out and a HJK as well as many other Pokemon. Also people who have a ghost on his/her team my hidden power dark instead of ice to cripple switching in ghost predicting to obvious HJK. And U-Turn to get away.
2. Ninetails @ Focus Sash
Ability:Drought
Evs:252Atk/4SpD/252Spe
Nature:Timid
Moves:Flamethrower
Hidden Power ground
Solarbeam
Nasty Plot
Well Ninetails for summoning endless sun. You might ask why did he choose a Focus Sash. Well I made it sashed because it could revenge kill a faster Pokemon.So I pretty much change the entire set. Switching Fire Blast because I can't risk a miss while dealing with Excadrills and FerroThorns. But, i can still OHKO them. I switch Hypnosis because it misses a lot and not reliable. Also i can Nasty Plot predicting the switch or Nasty ploting with the sash. Solarbeam because it has more power than energy ball also I have sun anyways. You might say what if they change the weather energy ball does almost nothing to the other weather summoners anyways.(Thank You Alpha Wolf)
3: Venusaur @ Leftovers( Thanks to Eternal for suggestion )
Ability: Chlorophyll
Evs:4Hp/252SpA/252Spe
Nature:Modest
Moves:Growth
Solarbeam
Hidden Power Fire
Sleep Powder
Next I choose my Chlorophyll Sweeper Venusaur. I choose this over Sawsbucks. Because Sawsbucks cannot take a mach punch from Infernape and/or Conkeldurr which are pretty common also Venusaur is able to block toxic Spikes and use Sleep Powder to growth sweep. Solarbeam and Hp fire can take down anything that dares to come in Venusaurs way. Anything but dragons Unless +6 SpA.
4.Latios @ Choice Specs
Ability: Levitate
Evs: 4 Hp/252SpA/252Spe
Nature:Timid
Moves: Draco Meteor
Dragon Pulse
Thunder
Psyshock
Because of Venusaurs lacking the ability to take down the common dragon threats my Next "Choice" (Get it? Choice) is Latios. To take down any dragon threat to my team also my mod to the smogon set is Thunder with 100% acc in rain it can also take down water types and politoeds.Also By removing surf I can add Dragon pulse and I have sweep more than half a team with it.
5. Victini @ Life Orb
Ability:Victory Star
Evs: 252Att/4Def/252Spee
Nature: Adamant
Moves: V-create
Fusion Bolt
U-turn
Brick Break
My next choose is Victini because of it's decent bulk and amazing V-create to take down any Eviolite Chanseys or Blisseys that dares to switch in. It can OHKO almost any pokemon who dares to switch into it. 180 power + Stab + Sun + Life Orb. Brick break recommended by #ratemyteam which has helped me take down steel types without the draw backs from V-Create
6.Reuniclus @ Leftovers
Ability: Regenerator
Evs: 172hp/252SpA/84Spe
Nature:Modest
Moves:Focus Blast
Psyshock
Recover
Calm Mind
I choose Reuniclus because it's perfect for calm minding in any weather and is able to sweep also it's decent bulk and High Hp is can take almost any move.
Thanks For Reading My First Post,
EvioliteEevee
Changes in Bold

1:Lead MienShao @ Life Orb
Ability: Regenerator
Evs: 252Atk/4SpA/252Spe
Nature:Naive
Moves:Fake Out
High Jump Kick
U-Turn
Hidden Power Dark
I changed to MienShao because it's good for taking out most leads as well weather summoners. It takes out T-tars with a Fake out and HJK and Politoeds(if not defensive set) and opposing Ninetails with Fake Out and a HJK as well as many other Pokemon. Also people who have a ghost on his/her team my hidden power dark instead of ice to cripple switching in ghost predicting to obvious HJK. And U-Turn to get away.

2. Ninetails @ Focus Sash
Ability:Drought
Evs:252Atk/4SpD/252Spe
Nature:Timid
Moves:Flamethrower
Hidden Power ground
Solarbeam
Nasty Plot
Well Ninetails for summoning endless sun. You might ask why did he choose a Focus Sash. Well I made it sashed because it could revenge kill a faster Pokemon.So I pretty much change the entire set. Switching Fire Blast because I can't risk a miss while dealing with Excadrills and FerroThorns. But, i can still OHKO them. I switch Hypnosis because it misses a lot and not reliable. Also i can Nasty Plot predicting the switch or Nasty ploting with the sash. Solarbeam because it has more power than energy ball also I have sun anyways. You might say what if they change the weather energy ball does almost nothing to the other weather summoners anyways.(Thank You Alpha Wolf)

3: Venusaur @ Leftovers( Thanks to Eternal for suggestion )
Ability: Chlorophyll
Evs:4Hp/252SpA/252Spe
Nature:Modest
Moves:Growth
Solarbeam
Hidden Power Fire
Sleep Powder
Next I choose my Chlorophyll Sweeper Venusaur. I choose this over Sawsbucks. Because Sawsbucks cannot take a mach punch from Infernape and/or Conkeldurr which are pretty common also Venusaur is able to block toxic Spikes and use Sleep Powder to growth sweep. Solarbeam and Hp fire can take down anything that dares to come in Venusaurs way. Anything but dragons Unless +6 SpA.

4.Latios @ Choice Specs
Ability: Levitate
Evs: 4 Hp/252SpA/252Spe
Nature:Timid
Moves: Draco Meteor
Dragon Pulse
Thunder
Psyshock
Because of Venusaurs lacking the ability to take down the common dragon threats my Next "Choice" (Get it? Choice) is Latios. To take down any dragon threat to my team also my mod to the smogon set is Thunder with 100% acc in rain it can also take down water types and politoeds.Also By removing surf I can add Dragon pulse and I have sweep more than half a team with it.

5. Victini @ Life Orb
Ability:Victory Star
Evs: 252Att/4Def/252Spee
Nature: Adamant
Moves: V-create
Fusion Bolt
U-turn
Brick Break
My next choose is Victini because of it's decent bulk and amazing V-create to take down any Eviolite Chanseys or Blisseys that dares to switch in. It can OHKO almost any pokemon who dares to switch into it. 180 power + Stab + Sun + Life Orb. Brick break recommended by #ratemyteam which has helped me take down steel types without the draw backs from V-Create

6.Reuniclus @ Leftovers
Ability: Regenerator
Evs: 172hp/252SpA/84Spe
Nature:Modest
Moves:Focus Blast
Psyshock
Recover
Calm Mind
I choose Reuniclus because it's perfect for calm minding in any weather and is able to sweep also it's decent bulk and High Hp is can take almost any move.
Thanks For Reading My First Post,
EvioliteEevee