I'm new to 5th Gen Ubers so I thought I might try it out. So I made a team and to test it out. After a while I came up with a sun team that does ok but I want to be sure it works so I'm posting here.
The Process:
Well... I decided I wanted to use Reshiram because of its beastness and ability to rip through teams so I made a Specs Reshiram.
Next I realized that Groudon would be a great partner for Reshiram because it provides sun boost and can provide SR as a lead.
Then I realized that both of them were weak to probably the most dangerous Pokemon in the game, Kyogre. Not much can stop a choice Kyogre but with prediction, Scarf Zekrom can kill it.
Then next I thought Groudon is usually paired with Jumpluff. With good reason though since Chlorophyll skyrockets Jumpluffs already high speed and with Sleep Powder and Leech Seed, Jumpluff can really troll.
As for spinners, there wasn't much chioce so I stuck with the standard and went with Forretress. Spinning and even more entry hazard worked well on my team even with the fire weakness.
Finally I thought, I could place another sweeper to increase the offensive pressure. I decided that Mewtwo has the right movepool for Specs and the movepool to touch everything.
Playing around a while, I realized I was dying too much so I sought a more defensive approach. I thought with status and entry hazards flying around, Espeon can switch in and use Dual Screens. I replaced Mewtwo to reduce weaknesses.
Turns out Espeon dies before getting a much in so I thought I need something else. My rocks and spikes were constantly being spun away so it led me to Giratina-O, spinblocker supreme and of course the additional offensive pressure was a plus too!
Okay, worked well until Dragon-types started Outraging and Draco Meteoring. Obviously I had way too much of a Dragon weakness so decided that Reshiram wouldn't do and need to be replaced by something else. Of course there are many powerful Uber worthy fire types so I was stuck for a while. Then I remember Ho-oh's hard hitter stats and Sacred Fire burns and I decided Ho-oh was the missing piece. Sure, its 4x weak to SR but I'll just have to utilize Forretress some more. Sure better than half team weak to one move.
Final...
Team:
1. Groudon @ Leftovers
Ability: Drought
Nature: Careful
EVs: 252 HP/ 4 Def/ 252 SpD
Stealth Rock
Earthquake
Stone Edge
Thunder Wave
A SpD oriented Groudon. It allows him to take it form both ends. Can even survive most of what Kyogre can dish out with this spread (with sun up of course). T-wave support is for helping slower hitters like Ho-oh and Giratina-O out. EQ is STAB while Stone Edge helps with coverage. SR is pretty obvious.
2. Jumpluff @ Leftovers
Ability: Chlorophyll
Nature: Jolly
EVs: 252 HP/ 4 Atk/ 252 Spd
Sleep Powder
Leech Seed
U-turn
Substitute
Under the sun this puff is very trolling. 700 speed is insanely fast and pretty much nothing could compete with it in terms of speed. As for using it, its one-dimensional. Put something to sleep, Leech Seed on the switch and then U-turn outta there. 252 HP gives Jumpluff some defensive insurance if Sleep Powder misses or something even though Jumpluff isn't the bulkiest Pokemon. Sub allows Jumpluff to hide from status and gives it a shield when seeding.
3. Ho-oh @ Life Orb
Ability: Pressure
Nature: Adamant
EVs: 232 HP/ 252 Atk/ 24 Spd
Sacred Fire
Brave Bird
Earthquake
Roost
This thing hits very hard. Like I've OHKO pokemon who resist Sacred Fire. Sacred Fire does a good 100 damage plus STAB plus the sun and max Attack and 50% burn to those who survive the onslaught. This is what makes Ho-oh so dangerous. If Ho-oh is against something resisting Sacred Fire then it can turn to Brave Bird which also hits hard. EQ provides good coverage as always and grounds out zappers trying to hurt Ho-oh. LO and Brave Bird will chip of Ho-oh's health so Roost keeps Ho-oh healthy so it can repeat the process.
4. Palkia @ Choice Scarf
Ability: Pressure
Nature: Timid
EVs: 4 Hp/ 252 SpA/ 252 Spd
Surf
Fire Blast
Thunderbolt
Spacial Rend
For Kyogre, otherwise it hits hard. Surf and Spacial Rend is STAB while T-bolt hits Kyogre and Fire Blast hits steels and gets boosted from the sun. Pretty simple.
5. Girantina-O @ Griseous Orb
Ability: Levitate
Nature: Niave
EVs: 248 Atk/ 64 SpA/ 196 Spd
Shadow Sneak
Dragon Tail
Draco Meteor
Hidden Power Fire
Mixed Attacker. Hits from both sides for damage. Shadow Sneak picks out fast, frail Pokemon who want to take Giratina in one fell swoop. Draco Meteor hits hard but since Girantina can hit from both sides, the SpA drop is less bothersome. Dragin Tail phazes oncoming sweepers, particularly SD Extremespeed Arceus while HP fire kills Forretress and Scizor and also boosted in sun.
6. Forretress @ Leftovers
Ability: Sturdy
Nature: Sassy
EVs: 252 HP/ 4 Def/ 252 SpD
IVs: Spd:0
Spikes
Toxic Spikes
Rapid Spin
Payback
The average Forretress. Bulky, spins and spikes. Switch on a move Forretress can take with impunity and spin if their is any entry hazards and set up Spikes/Toxic Spikes. Payback is the only way to hurt SubCM Giratina-O.
That's my team. I'd appreciate anything you can find wrong.
Bolded is edited thanks to Fireburn :)
Thanks
The Process:
Well... I decided I wanted to use Reshiram because of its beastness and ability to rip through teams so I made a Specs Reshiram.

Next I realized that Groudon would be a great partner for Reshiram because it provides sun boost and can provide SR as a lead.


Then I realized that both of them were weak to probably the most dangerous Pokemon in the game, Kyogre. Not much can stop a choice Kyogre but with prediction, Scarf Zekrom can kill it.



Then next I thought Groudon is usually paired with Jumpluff. With good reason though since Chlorophyll skyrockets Jumpluffs already high speed and with Sleep Powder and Leech Seed, Jumpluff can really troll.




As for spinners, there wasn't much chioce so I stuck with the standard and went with Forretress. Spinning and even more entry hazard worked well on my team even with the fire weakness.





Finally I thought, I could place another sweeper to increase the offensive pressure. I decided that Mewtwo has the right movepool for Specs and the movepool to touch everything.






Playing around a while, I realized I was dying too much so I sought a more defensive approach. I thought with status and entry hazards flying around, Espeon can switch in and use Dual Screens. I replaced Mewtwo to reduce weaknesses.






Turns out Espeon dies before getting a much in so I thought I need something else. My rocks and spikes were constantly being spun away so it led me to Giratina-O, spinblocker supreme and of course the additional offensive pressure was a plus too!






Okay, worked well until Dragon-types started Outraging and Draco Meteoring. Obviously I had way too much of a Dragon weakness so decided that Reshiram wouldn't do and need to be replaced by something else. Of course there are many powerful Uber worthy fire types so I was stuck for a while. Then I remember Ho-oh's hard hitter stats and Sacred Fire burns and I decided Ho-oh was the missing piece. Sure, its 4x weak to SR but I'll just have to utilize Forretress some more. Sure better than half team weak to one move.


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Final...
Team:
1. Groudon @ Leftovers
Ability: Drought
Nature: Careful
EVs: 252 HP/ 4 Def/ 252 SpD

Stealth Rock
Earthquake
Stone Edge
Thunder Wave
A SpD oriented Groudon. It allows him to take it form both ends. Can even survive most of what Kyogre can dish out with this spread (with sun up of course). T-wave support is for helping slower hitters like Ho-oh and Giratina-O out. EQ is STAB while Stone Edge helps with coverage. SR is pretty obvious.
2. Jumpluff @ Leftovers
Ability: Chlorophyll
Nature: Jolly
EVs: 252 HP/ 4 Atk/ 252 Spd

Sleep Powder
Leech Seed
U-turn
Substitute
Under the sun this puff is very trolling. 700 speed is insanely fast and pretty much nothing could compete with it in terms of speed. As for using it, its one-dimensional. Put something to sleep, Leech Seed on the switch and then U-turn outta there. 252 HP gives Jumpluff some defensive insurance if Sleep Powder misses or something even though Jumpluff isn't the bulkiest Pokemon. Sub allows Jumpluff to hide from status and gives it a shield when seeding.
3. Ho-oh @ Life Orb
Ability: Pressure
Nature: Adamant
EVs: 232 HP/ 252 Atk/ 24 Spd

Sacred Fire
Brave Bird
Earthquake
Roost
This thing hits very hard. Like I've OHKO pokemon who resist Sacred Fire. Sacred Fire does a good 100 damage plus STAB plus the sun and max Attack and 50% burn to those who survive the onslaught. This is what makes Ho-oh so dangerous. If Ho-oh is against something resisting Sacred Fire then it can turn to Brave Bird which also hits hard. EQ provides good coverage as always and grounds out zappers trying to hurt Ho-oh. LO and Brave Bird will chip of Ho-oh's health so Roost keeps Ho-oh healthy so it can repeat the process.
4. Palkia @ Choice Scarf
Ability: Pressure
Nature: Timid
EVs: 4 Hp/ 252 SpA/ 252 Spd

Surf
Fire Blast
Thunderbolt
Spacial Rend
For Kyogre, otherwise it hits hard. Surf and Spacial Rend is STAB while T-bolt hits Kyogre and Fire Blast hits steels and gets boosted from the sun. Pretty simple.
5. Girantina-O @ Griseous Orb
Ability: Levitate
Nature: Niave
EVs: 248 Atk/ 64 SpA/ 196 Spd

Shadow Sneak
Dragon Tail
Draco Meteor
Hidden Power Fire
Mixed Attacker. Hits from both sides for damage. Shadow Sneak picks out fast, frail Pokemon who want to take Giratina in one fell swoop. Draco Meteor hits hard but since Girantina can hit from both sides, the SpA drop is less bothersome. Dragin Tail phazes oncoming sweepers, particularly SD Extremespeed Arceus while HP fire kills Forretress and Scizor and also boosted in sun.
6. Forretress @ Leftovers
Ability: Sturdy
Nature: Sassy
EVs: 252 HP/ 4 Def/ 252 SpD
IVs: Spd:0

Spikes
Toxic Spikes
Rapid Spin
Payback
The average Forretress. Bulky, spins and spikes. Switch on a move Forretress can take with impunity and spin if their is any entry hazards and set up Spikes/Toxic Spikes. Payback is the only way to hurt SubCM Giratina-O.
That's my team. I'd appreciate anything you can find wrong.
Bolded is edited thanks to Fireburn :)
Thanks