My first rate my team as well, criticize me if you would like.
I started off my team with dialga, cause you know i figured dialga is bulky enough to set up the rocks and take a few hits. (Good defensive typing)
Name: Dialga
Item: Leftovers
Nature & Ev's: Calm & HP 252 Sdef 252 & 4 Spe
Moves:
Thunder wave
Thunderbolt
Draco meteor
Stealth rock
Purpose: Dialga sets up the rocks and will usually paralyze the other lead and switch to save him for later. Thunder bolt is to hit those pesky scarfed kyogre leads with water spout. Draco is kinda self explanatory, it also helps a lot for the mixed rayquaza sets. Will always OHKO after stealth rocks. ( The occasional sash set). Stealth rocks are vital for this team, so I try to keep dialga alive for a while if the opponent has a spinner. Groudon lead kill this set and its mother, but my other pokemon can usually counter groudon, so its fine. I was thinking about putting fire blast over thunderbolt for forretress, but since hazards really don't kill this team I didn't. I have another pokemon for that.
Next up I tried a few pokemon for the physical set up and attack. I tried rayquaza, zekrom, and finally ended up with ekiller arceus.
Name: Arceus
Item: Silk scarf
Nature & Ev's: Adamant Hp 132, Att 120, Def 116, Sdef 124 & Spe 16
Moves:
Swords dance
Extremespeed
Recover
Stone edge
Purpose: Set up and sweep, the only reason I have stone edge is so I don't get walled by skarmory though its rare, or giratina. I run the bulkier set and the 16 speed ev's because in the case that i run into another arceus i may be able to outspeed if they have no ev's in speed and I can live a few attacks, recover and continue attacking him. He is reliable on pretty much every team if you can fit him on. He has the best stat count in the game, and is very versatile. He KO's at least 1 pokemon a game.
After I needed a quick, strong special attacker. I chose specs mewtwo because I read on the smog that he was a bawse.
Name: Mewtwo
Item: Choice specs
Nature & Ev's: Timid Spe 252, Spatt 252 & 4 Hp
Moves:
Psystrike
Focus blast
Ice beam
Fire blast
Purpose: My main forretress and ferrothorn killer. No one likes them on the other team so might as well kill them right? Solid OHKO on forretress after sturdy is broken. (fire blast) In the rain a max spdef ferrothorn its still a 2HKO. It can also live a no silk scarf +2 max attack extremespeed from arceus and OHKO with focus blast. I have tried the calm mind set, but it is so boring and predictable i didn't enjoy it. Mewtwo usually comes in as a late game sweeper or as soon as the pokemon previously mentioned come in. Then he proceeds to wreck the other team.
Some defense with giratina
Name: Giratina
Item: Leftovers
Nature & Ev's: Impish Hp 252, Def 252, & Sdef 4
Moves:
Shadow sneak
Dragon tail
Toxic
Rest
Purpose: My physical wall. It works very well, even with rest. I am tempted to use will-o-wisp, but toxic can be so much more helpful sometimes. My essential arceus counter. Nobody runs substitute on arceus (or at least i haven't encountered it. I switch in and dragon tail him out to reset changes. I keep mentioning arceus because he is a huge threat in ubers. With this thing i try to get it in and status the majority of the opponents pokemon. Shadow sneak is for threats like mewtwo it will scare a weakened one away. Also priority for focus sashes. It also OHKO's deoxys-A. Has the best defensive stats in the game as of right now.
Some Spdef Blissey
Name: Blissey
Item: Leftovers
Nature & Ev's: Bold Hp 136 Def 252 & Spdef 120
Moves:
Wish
Protect
Ice beam
Seismic toss
Purpose: My special wall. First, i want to point out I've been thinking of switching wish and protect to aromatherapy and soft boiled. This will allow me to wake up the resting giratina and possibly the burned arceus, while on the other hand i won't be able to wish pass to weakened mewtwo or zekrom. Give me your opinion. Ice beam is rarely seen on blissey and it is mainly for rayquaza and other dragon/flying types or just dragon types period. Siesmic toss is pretty much blisseys only reliable damage force other than ghost types, giratina usually so thats why i have ice beam, thinking of changing that to toxic. Though i would then get completely walled by a resttalking giratina which i see a lot for some reason.
Lastly a revenge killer and who else but kyurem-B for the job
Name: Kyurem-B
Item: Choice scarf
Nature & Ev's: Jolly Att 252, Spe 252 & Hp 4
Moves:
Fusion Bolt
Outrage
Shadow Claw/Filler
Stone Edge/Filler
Purpose: Revenge killer/ late game sweeper. He is a complete and total powerhouse with 439 att without a att increasing nature. It does not need to risk the bolt strike miss with that intense att, so i use fusion bolt. I am already locked into an attack so Outrage over dragon claw. (I usually try to avoid it if there is a steel type on the opponents team.) The other two moves are fillers so if you plan on trying this team, feel free to change shadow claw and stone edge. This guy has won me the game so many times it is incredible.
Conclusion
I have really enjoyed using this team. I have also been very successful. There aren't any major wreck my team threats, that i have encountered. If you have any suggestions please let me know so i can consider them. All the abilities are the standard which is why i didn't include them. Thank you.
I started off my team with dialga, cause you know i figured dialga is bulky enough to set up the rocks and take a few hits. (Good defensive typing)

Name: Dialga
Item: Leftovers
Nature & Ev's: Calm & HP 252 Sdef 252 & 4 Spe
Moves:
Thunder wave
Thunderbolt
Draco meteor
Stealth rock
Purpose: Dialga sets up the rocks and will usually paralyze the other lead and switch to save him for later. Thunder bolt is to hit those pesky scarfed kyogre leads with water spout. Draco is kinda self explanatory, it also helps a lot for the mixed rayquaza sets. Will always OHKO after stealth rocks. ( The occasional sash set). Stealth rocks are vital for this team, so I try to keep dialga alive for a while if the opponent has a spinner. Groudon lead kill this set and its mother, but my other pokemon can usually counter groudon, so its fine. I was thinking about putting fire blast over thunderbolt for forretress, but since hazards really don't kill this team I didn't. I have another pokemon for that.
Next up I tried a few pokemon for the physical set up and attack. I tried rayquaza, zekrom, and finally ended up with ekiller arceus.

Name: Arceus
Item: Silk scarf
Nature & Ev's: Adamant Hp 132, Att 120, Def 116, Sdef 124 & Spe 16
Moves:
Swords dance
Extremespeed
Recover
Stone edge
Purpose: Set up and sweep, the only reason I have stone edge is so I don't get walled by skarmory though its rare, or giratina. I run the bulkier set and the 16 speed ev's because in the case that i run into another arceus i may be able to outspeed if they have no ev's in speed and I can live a few attacks, recover and continue attacking him. He is reliable on pretty much every team if you can fit him on. He has the best stat count in the game, and is very versatile. He KO's at least 1 pokemon a game.
After I needed a quick, strong special attacker. I chose specs mewtwo because I read on the smog that he was a bawse.

Name: Mewtwo
Item: Choice specs
Nature & Ev's: Timid Spe 252, Spatt 252 & 4 Hp
Moves:
Psystrike
Focus blast
Ice beam
Fire blast
Purpose: My main forretress and ferrothorn killer. No one likes them on the other team so might as well kill them right? Solid OHKO on forretress after sturdy is broken. (fire blast) In the rain a max spdef ferrothorn its still a 2HKO. It can also live a no silk scarf +2 max attack extremespeed from arceus and OHKO with focus blast. I have tried the calm mind set, but it is so boring and predictable i didn't enjoy it. Mewtwo usually comes in as a late game sweeper or as soon as the pokemon previously mentioned come in. Then he proceeds to wreck the other team.
Some defense with giratina

Name: Giratina
Item: Leftovers
Nature & Ev's: Impish Hp 252, Def 252, & Sdef 4
Moves:
Shadow sneak
Dragon tail
Toxic
Rest
Purpose: My physical wall. It works very well, even with rest. I am tempted to use will-o-wisp, but toxic can be so much more helpful sometimes. My essential arceus counter. Nobody runs substitute on arceus (or at least i haven't encountered it. I switch in and dragon tail him out to reset changes. I keep mentioning arceus because he is a huge threat in ubers. With this thing i try to get it in and status the majority of the opponents pokemon. Shadow sneak is for threats like mewtwo it will scare a weakened one away. Also priority for focus sashes. It also OHKO's deoxys-A. Has the best defensive stats in the game as of right now.
Some Spdef Blissey

Name: Blissey
Item: Leftovers
Nature & Ev's: Bold Hp 136 Def 252 & Spdef 120
Moves:
Wish
Protect
Ice beam
Seismic toss
Purpose: My special wall. First, i want to point out I've been thinking of switching wish and protect to aromatherapy and soft boiled. This will allow me to wake up the resting giratina and possibly the burned arceus, while on the other hand i won't be able to wish pass to weakened mewtwo or zekrom. Give me your opinion. Ice beam is rarely seen on blissey and it is mainly for rayquaza and other dragon/flying types or just dragon types period. Siesmic toss is pretty much blisseys only reliable damage force other than ghost types, giratina usually so thats why i have ice beam, thinking of changing that to toxic. Though i would then get completely walled by a resttalking giratina which i see a lot for some reason.
Lastly a revenge killer and who else but kyurem-B for the job

Name: Kyurem-B
Item: Choice scarf
Nature & Ev's: Jolly Att 252, Spe 252 & Hp 4
Moves:
Fusion Bolt
Outrage
Shadow Claw/Filler
Stone Edge/Filler
Purpose: Revenge killer/ late game sweeper. He is a complete and total powerhouse with 439 att without a att increasing nature. It does not need to risk the bolt strike miss with that intense att, so i use fusion bolt. I am already locked into an attack so Outrage over dragon claw. (I usually try to avoid it if there is a steel type on the opponents team.) The other two moves are fillers so if you plan on trying this team, feel free to change shadow claw and stone edge. This guy has won me the game so many times it is incredible.
Conclusion
I have really enjoyed using this team. I have also been very successful. There aren't any major wreck my team threats, that i have encountered. If you have any suggestions please let me know so i can consider them. All the abilities are the standard which is why i didn't include them. Thank you.