Rait my sun team.

Nine Tailed Fox (Ninetales) (F) @ Leftovers
Trait: Drought
EVs: 252 SAtk / 252 Spd
Timid Nature (+Spd, -Atk)
- Fire Blast
- Energy Ball
- Hidden Power [Ice]
- Will-O-Wisp
Here i have my obvious lead, no need to explain too much. 

Grass GOD (Venusaur) (M) @ Black Sludge
Trait: Chlorophyll
EVs: 252 SAtk / 4 SDef / 252 Spd
Modest Nature (+SAtk, -Atk)
- SolarBeam
- Hidden Power [Fire]
- Sleep Powder
- Growth
Here is my super sweeper, a basic powerful Venusaur. Puts em asleep, and then boost with growth.

Fire Angel (Volcarona) (M) @ Leftovers
Trait: Flame Body
EVs: 240 HP / 216 Def / 52 Spd
Hardy Nature
- Quiver Dance
- Fire Blast
- Bug Buzz
- Roost
Then i have volcarona, with its pretty much basic sun set.

Latziken (Latias) (F) @ Leftovers
Trait: Levitate
EVs: 228 HP / 104 Def / 176 Spd
Timid Nature (+Spd, -Atk)
- Dragon Pulse
- Thunderbolt
- Calm Mind
- Roost
I have latias to take out polytoad, which is too overused in the meta game right now, and the sun's rival.

Dragonite (M) @ Leftovers
Trait: Multiscale
EVs: 252 HP / 120 Def / 136 SDef
Adamant Nature (+Atk, -SAtk)
- Dragon Dance
- Dragon Claw
- ExtremeSpeed
- Roost
I'm thinking of adding Equake to dragonite, or fire puch, but i dont know what to take off. 

Knock you out! (Hitmontop) (M) @ Life Orb
Trait: Technician
EVs: 252 HP / 252 Atk / 4 Def
Adamant Nature (+Atk, -SAtk)
- Rapid Spin
- Sucker Punch
- Mach Punch
- Fake Out
And this guy is my spinner since fire types, especially volcarona is weak to stealth rock. And he is also good to damage tyranitar a bit. 

As you see my team is pretty basic, but it works well, and covers alot of its weaknesses. But i can use some help because i feel like alot of things are still wrong with it.

Taking a glance at this team it's very Heatran weak. Heatran can juggle most of your team with a combination of Stealth and Roar and nothing gets in a safe switch as it either fears the Lava Plume or Earth Power. Technitop isn't the best spinner out there as it can't switch in safely most of the time and this current set is more or less setup bait for threats like Dragonite and Sheer Force Landorus. An ideal swap for Technitop would be Donphan who can spin away and setup rocks as well as ease the pressure of Tyranitar on your team. Onto Dragonite I'd give it Earthquake over Roost as your Heatran weakness is more major than a Steel type weakness. Onto Volcarona I'd replace it all together,preferably with Heatran. Any offensive Heatran set could do,such as a Sub+3 attacks. Finally,while not a major weakness,a Scarf Latios out speeds your Venusaur and can KO it in its current set. In order to out speed it you would need a Timid nature with at least 180 EVs in speed.

Agreeing with royal-x completely on what he said. 

I was thinking of Band on nite, to seriously break down walls, letting Venusaur clean up. EQ/Outrage/Fire Punch/ESpeed are the moves.

If you need to combat Heatran further, I was actually thinking of mixSaur, with Sleep Powder/Giga Drain/EQ/Hp Ice. 

I was also thinking of CB scizor over Volcarona, because it helps deals with your Latios weakness. Granted, Latios needs to kill something off before Scizor can pursuit trap it. CB bullet punch is also an effective late-game cleaner. 

Donphan>Technitop because more solid physical bulk, Rapid Spin support and access to Stealth Rock makes it an invaluable member on sun teams. 

Since Rain troubles you greatly, you might want to try Specs Keldeo to destroy rain, taking advantage of rain and blasting holes through the opponent's team with Hydro Pump, with Specs, STAB and Rain boosting it. It also blasts down sand, secret swords makes quick work of t-tar and Hydro Pump for hippo. Icy wind is generally for dragons, slowing them down. HP electric is mainly filler to destroy DD gyara, which would then pose as a major threat to your team. I would prefer it to be used over Latias. 

That's about it from me i guess. =x

you have a latias for politoad but hes not only the rain team , For example i use ludicolo myself Surf + rain dance , switching to venusaur could be dangerous if i used raindance then switch to kingdra, swift swim kingdra would probably be faster than latias , this point on you are trapped ( gyarados )