[CrackinSkulls]

Hi there this is a serious HO team that you have there, I can see the OU influence in it ;). Now your team has a HUGE amount of offensive pressure, which can be very daunting, however, the only pivot switch you have really is Groudon who won't enjoy switching in on anything special. It is a fairly good team that utilizes a few underrated threats like Blaziken. However, I believe that it has some room for improvement.

Threats

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The standout threats for me on against this team are:



Ho-oh in the sun is extremely dangerous and while Stealth Rock will do a number on it, the thanksgiving turkey will remain a constant thorn in your side because the only person on your team that can hope for a KO currently is Arceus.
+2 Extremespeed w/o Life Orb 252 Atk vs 248 HP/ 0 DEF Adamant Ho-oh : 71.57 - 84.1% guaranteed 2HKO
Unfortunately in the case of a sub Ho-oh you will not have any opportunity to SD so it can easily 2HKO you in return
Sacred Fire (SUN) w/o Life Orb 168 Atk vs 4 HP/ 0 Def Adamant Arceus : 56.69 - 66.93% guaranteed 2HKO
Although Groudon does have Stone Edge you have invested minimal Attack or Speed EV's so Ho-oh can simply stall out Stone Edge and burn with Sacred Fire. Dragon Tail will fail to phaze Ho-oh as even unburned it will fail to break its Substitutes.
Stone Edge (BURNED) w/o Life Orb 4 Atk Groudon vs 248 HP/ 0 Def Adamant Ho-oh (ROOST) : 26.99 - 32.29% 4-5 hits to KO
While Jumpluff would be a thorn in Ho-oh's side with encore against Substitute it does not want to mispredict and eat a Brave Bird or Sacred Fire. Even Palkia won't be able to revenge it reliably.
Surf (SUN) w/o Life Orb 252 SAtk Timid Palkia vs 248 HP/ 84 SDef Ho-oh : 27.47 - 32.53% 4-5 hits to KO
Brave Bird w/o Life Orb 168 Atk Adamant Ho-oh vs 4 HP/ 0 Def Timid Palkia : 42.37 - 49.84% guaranteed 2HKO after SR



The second biggest threat i can see is SAND and more specifically Excadrill

Sand will also have a huge advantage against this team because it can take away Jumpluff's speed, Blazikens strength and give your opponent a massive advantage. Excadrill in the sand will singlehandedly 6-0 you. Even Groudon will be KO'd before you can do anything to it.
+2 Earthquake w/ Life Orb 252 Atk Adamant Excadrill vs 252 HP/ 252 Def Impish Groudon : 67.57 - 79.48% guaranteed 2HKO
While Life Orb Excadrill does hit like a truck it isn't as dangerous as Air Balloons Excadrill because Groudon can simply KO back with Earthquake however Air Balloons Excadrill will also hit hard and KO you before you can touch it. It doesn't even need Jolly because it will oustpeed everything on your team including +2 Blaziken in the sun
+2 Earthquake w/o Life Orb 252 Atk Adamant Excadrill vs 252 HP/ 252 Def Impish Groudon : 51.98 - 61.14% guaranteed 2HKO
even the more common (with Air Balloon) Jolly Excadrill will do:
+2 Earthquake w/o Life Orb 252 Atk Jolly Excadrill vs 252 HP/ 252 Def Impish Groudon : 47.52 - 55.94% ~80% chance to 2HKO after Stealth Rock.
After Groudon is KO'd your entire team is OHKO'd by a +2 Excadrill with the exception of Ferrothorn who is set up fodder allowing to to belt even more SD's. Excadrill can't even be revenge killed by Arceus thanks to his Steel typing.
Extremespeed w/o Life Orb 252 Atk Adamant Arceus vs 4 HP/ 0 Def Excadrill : 28.18 - 33.43% 3-4 Hits to KO

Team Changes

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Now onto team changes:

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First off I suggest replacing Ferrothorn with Giratina-A. Not only does it give a great deal of bulk to the team, giving a safe switch-in to Kyogre it can also phaze out Ho-oh, forcing it to take another round of Stealth Rock damage and burn Excadrill, rendering it useless for the rest of the match. You don't lose out on much save the ability to lay down hazards and you gain a more reliable way to take on powerful threats such as Extreme Killer Arceus which can be Burned and phazed out. To give you and idea of its sturdiness i will attach some damage calcs:
+2 Earthquake w/o Life Orb 252 Atk Jolly Excadrill vs 252 HP/ 252 Def Impish Giratina-A : 42.26 - 50% guaranteed 3HKO (2HKO after SR)
although it does hit very hard once he tanks the first hit he can simply burn it, rest off the damage and phaze it out. The same applies for Extreme Killer Arceus
+2 Shadow Claw w/o Life Orb 252 Atk Adamant Arceus vs 252 HP/ 252 Def Impish Giratina-A : 40.08 - 47.22% guaranteed 3HKO
It can also shrug off anything Ho-oh has to throw at it.
Brave Bird w/o Life Orb 168 Atk Adamant Ho-oh vs 252 HP/ 252 Def Impish Giratina-A : 17.06 - 20.24% 5-6 hits to KO
Although it can't burn Ho-oh it literally takes pittance from anything Ho-oh has to offer. Keep in mind though if you run Dragon Tail Ho-oh can actually beat you 1v1 because it will fail to Break its Subs.

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Next up as much as you love Jumpluff and as annoying as it is i think it should be replaced by Sub-Seed Shaymin-S. Although you do lose out on the insanely fast Encore and Sleep Powder you do gain a few things. First and foremost you get Seed Flare. It is also far more difficult to counter because common switch ins to it such as Arceus-Grass won't be nearly as safe due to Air Slash. Also Behind a Sub it is free to fire off Seed Flares as well as SubSeed making it fare more difficult to counter. It tear a huge chunk out of all the weather inducers notably Tyranitar ending any hopes Excadrill had.
Seed Flare w/o Life Orb 252 SAtk Timid Shaymin-S vs 252 HP/ 184 SDef Tyranitar (SAND) : 70.54 - 83.17% guaranteed 2HKO
Seed Flare w/o Life Orb 252 SAtk Timid Shaymin-S vs 4 HP/ 0 SDef Kyogre : 81.82 - 96.77% guaranteed 2HKO
It also has a neat niche for its flinch-haxing which lets it get past things like Darkrai and Arceus-Grass and the likes (basically anything that it is faster than). It will not only serve as a SubSeeder but also as a Sub Attacker which is in keeping with the HO theme of the team. Behind a Sub it is safe to either start seeding away or to fire off Seed Flares and Air Slashes.

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Lastly Arceus doesn't provide you with a great deal of synergy so although you will lose out on a fair bit of power I suggest an Arceus-Steel over your current form. He gels nicely in my opinion with all his teammates and you don't have to forgo a powerful SD sweeper. He rounds off a neat set of resistances which means that although your team is jam-packed with hard hitters they can also share a few hits between them. While he could take a back-seat role given the nature of your team I'm sure you would be dying to slap SD on him. He has great synergy and can punch big holes in anything unresisted.

Nitpicks

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Now for a couple of nitpicks. Blaziken loves Life Orb. Although it may seem counterproductive with his recoil moves it makes him punch a lot harder, something very much necessary in the ubers environment. anyway if your expecting him to stick around you aren't using him right.

Summary

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In summary:
Giratina-A>Ferrothorn
Pros: Better check to Ho-oh and Excadrill. Sturdier physical wall. Recovery Will-O-Wisp + Phazing.
Cons: No entry hazards or Leech Seed

Arceus-Steel>Arceus
Pros: Better Synergy. Much better resist; easier time setting up.
Cons: No Extremespeed and if you run it no STAB.

Shaymin-S>Jumpluff
Pros: Harder hittng. Less Sun reliant. Harder to counter.
Cons: Not as fast. No Encore or Sleep Powder.

LO on Blaziken
Pros: Hits MUCH harder.
Cons: Doesn't live as long.

The Sets

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Arceus-Steel @ Steel Plate
Trait: Multitype
252 Atk/ 4 Def / 252 Spe
Jolly Nature (+ Spe, -SAtk)
- Swords Dance
- Iron Head
- Earthquake/ Extremespeed/ Brick Break
- Recover


Giratina @ Leftovers
Trait: Pressure
252 HP/ 244 Def/ 12 Spe
Impish Nature (+Def, -SAtk)
- Rest
- Sleep Talk
- Roar/ Dragon Tail
- Will-O-Wisp


Shaymin-S @ Leftovers
Trait: Serene Grace
252 SAtk/ 4 SDef/ 252 Spe
Timid Nature (+Spe, -Atk)
- Substitute
- Leech Seed
- Air Slash
- Seed Flare

Ok well thats that. I hope you take time to read it all even if it is a bit long because you could get something out of it. anyway good luck with your team and i hope i could help.