ORAS Ubers RMT- Offensive Ubers Team, With A Few Twists

[YOLIT1]

This is my first RMT, and my first serious effort in making a team in several months. Even before that, I wasn't the greatest, so please be gentle.

That said, I'm no slouch when it comes to random stuff that has a high risk of not working, and this team is no exception. It's an offensively oriented team, but may be classified otherwise. This is mostly due to my lack of knowledge on what I'm saying in the realm of balanced teams, hyper offense, and stuff like that.

Anywho, the first thing that popped into my head was Groudon. Most of them run a Red Orb, but to specifically counter those I opted for a Choice Scarf revenge killer on mine.

Groudon @ Choice Scarf
Ability: Drought
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Precipice Blades
- Dragon Claw
- Fire Punch
- Stone Edge

This set mainly focuses on doing what any revenge killers do, and especially excels at screwing over enemy Primal Groudon. Since it outspeeds them, isn't weak to Precipice Blades, and runs a Precipice Blades of it's own, it forms a very good check and possibly counter if played right. (At least in my head .-.) Earthquake can probably also be used in place of Precipice Blades, but I favored the extra power in this case.

Next up, I added my favorite Pokemon and an epic special sweeper: Shaymin-S.

Spearmint (Shaymin-Sky) @ Leftovers
Ability: Serene Grace
Shiny: Yes
EVs: 4 HP / 252 SpA / 252 Spe
Modest Nature
- Seed Flare
- Air Slash
- Earth Power
- Substitute

This set is based somewhat off of the popular SubSeed set, but instead of using Leech Seed I just opted for Leftovers and an extra coverage move. Other than using Earth Power for the extra coverage, it operates pretty much the same as usual.

For the third and final member of my core, I noticed that my team was weak to several pretty up there threats. This was done at a glance, since I've yet the patience to go deeper, but a good answer at the time looked like Mega Lucario.

Lucario-Mega @ Lucarionite
Ability: Adaptability
EVs: 4 Def / 252 SpA / 252 Spe
Modest Nature
- Nasty Plot
- Aura Sphere
- Flash Cannon
- Psychic

Did I mention it's not a physical set? Yeah... I made this one into a second special sweeper, this one based off of Nasty Plot. I put in Aura Sphere, but Focus Blast can also be run for the extra power. I decided against it for accuracy reasons, but still debate that. Flash Cannon is steel coverage and allows me to take on Xerneas pretty well, and Psychic is there for coverage.

Next up, I decided to go ahead and add my Steal Rocker, because no team is complete without that or a Defogger. My pick was Garchomp.

Garchomp @ Rocky Helmet
Ability: Rough Skin
Shiny: Yes
EVs: 252 Atk / 4 SpA / 252 Spe
- Stealth Rock
- Earthquake
- Dragon Tail
- Fire Blast

This is literally just the basic tank set from OU. I use this as my lead, and it works just like a normal set.

Because I like clerics and because this team isn't weird enough as it is, I picked up Blissey.

Blissey @ Shed Shell
Ability: Natural Cure
EVs: 248 HP / 252 SpD / 8 Spe
Calm Nature
- Toxic
- Heal Bell
- Wish
- Protect

This set gets completely stomped by anything with Taunt, but otherwise performs very well. Spreading toxic can easily cripple the biggest special threats besides taking next to nothing from them, and it provides more support with Wish and Heal Bell. Protect is there mainly so that Blissey can use its own Wishes instead of always passing them, and Shed Shell is there to escape whatever trappers want to ruin my day.

Finally, RAW POWA.

Terrakion @ Choice Band
Ability: Justified
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Close Combat
- Stone Edge
- Quick Attack
- Iron Head

This set is an average choice band set, with more investment in speed to take out other choice sets and just kill faster in general. I can see exactly why this is probably a bad move, but I wanted to try it out anyway.


I haven't yet tried this out, mostly from being so afraid this is going to fail epicly and lack of experience. Thanks for reading through all of that, and for telling me exactly if/how my suspicions are correct.

 

[oversway]

before anything else I would suggest adding specifics to your descriptions, just saying 'several up there threats' and 'Psychic is there for coverage' doesn't allow people to understand your thought process when building. There also isn't any clear synergy between your team members.
About the actual team though, I'm sorry but many of the sets just aren't viable. Scarf don doesn't reliably check anything in the ORAS meta, and Psychic on Lucario is ironic since that moveslot is usually dedicated to priority to hit Darkrai. While rocky helmet chomp is a top tier mon in OU, it doesn't have many uses in Ubers. Terrak can be helpful in very specific situations, but it's niches are few enough that it was rejected for an analysis. Shoring up the sets would probably be a good first step, you can replace scarf don with a support pdon set with Stealth Rock. If you want to run special lucario, replace Psychic with Vacumn Wave, I recommend running Timid as well so you outspeed Latios. You lack an Arceus form which is mandatory a majority of the time in ORAS so if you're looking for something to sponge physical hits consider Waterceus; dragceus and groundceus are also options.

suggested sets

Groudon-Primal @ Red Orb
Ability: Desolate Land
EVs: 248 HP / 8 Atk / 252 SpD
Careful Nature
- Thunder Wave
- Precipice Blades
- Stealth Rock
- Dragon Tail/Stone Edge
(there are many different ev and moveslot options for the support set, this is just an example)

Lucario-Mega @ Lucarionite
Ability: Adaptability
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Nasty Plot
- Aura Sphere
- Flash Cannon
- Vacumn Wave

 

[SuperSixFighters]

This is my first RMT, and my first serious effort in making a team in several months. Even before that, I wasn't the greatest, so please be gentle.

That said, I'm no slouch when it comes to random stuff that has a high risk of not working, and this team is no exception. It's an offensively oriented team, but may be classified otherwise. This is mostly due to my lack of knowledge on what I'm saying in the realm of balanced teams, hyper offense, and stuff like that.

Anywho, the first thing that popped into my head was Groudon. Most of them run a Red Orb, but to specifically counter those I opted for a Choice Scarf revenge killer on mine.

Groudon @ Choice Scarf
Ability: Drought
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Precipice Blades
- Dragon Claw
- Fire Punch
- Stone Edge

This set mainly focuses on doing what any revenge killers do, and especially excels at screwing over enemy Primal Groudon. Since it outspeeds them, isn't weak to Precipice Blades, and runs a Precipice Blades of it's own, it forms a very good check and possibly counter if played right. (At least in my head .-.) Earthquake can probably also be used in place of Precipice Blades, but I favored the extra power in this case.

Next up, I added my favorite Pokemon and an epic special sweeper: Shaymin-S.

Spearmint (Shaymin-Sky) @ Leftovers
Ability: Serene Grace
Shiny: Yes
EVs: 4 HP / 252 SpA / 252 Spe
Modest Nature
- Seed Flare
- Air Slash
- Earth Power
- Substitute

This set is based somewhat off of the popular SubSeed set, but instead of using Leech Seed I just opted for Leftovers and an extra coverage move. Other than using Earth Power for the extra coverage, it operates pretty much the same as usual.

For the third and final member of my core, I noticed that my team was weak to several pretty up there threats. This was done at a glance, since I've yet the patience to go deeper, but a good answer at the time looked like Mega Lucario.

Lucario-Mega @ Lucarionite
Ability: Adaptability
EVs: 4 Def / 252 SpA / 252 Spe
Modest Nature
- Nasty Plot
- Aura Sphere
- Flash Cannon
- Psychic

Did I mention it's not a physical set? Yeah... I made this one into a second special sweeper, this one based off of Nasty Plot. I put in Aura Sphere, but Focus Blast can also be run for the extra power. I decided against it for accuracy reasons, but still debate that. Flash Cannon is steel coverage and allows me to take on Xerneas pretty well, and Psychic is there for coverage.

Next up, I decided to go ahead and add my Steal Rocker, because no team is complete without that or a Defogger. My pick was Garchomp.

Garchomp @ Rocky Helmet
Ability: Rough Skin
Shiny: Yes
EVs: 252 Atk / 4 SpA / 252 Spe
- Stealth Rock
- Earthquake
- Dragon Tail
- Fire Blast

This is literally just the basic tank set from OU. I use this as my lead, and it works just like a normal set.

Because I like clerics and because this team isn't weird enough as it is, I picked up Blissey.

Blissey @ Shed Shell
Ability: Natural Cure
EVs: 248 HP / 252 SpD / 8 Spe
Calm Nature
- Toxic
- Heal Bell
- Wish
- Protect

This set gets completely stomped by anything with Taunt, but otherwise performs very well. Spreading toxic can easily cripple the biggest special threats besides taking next to nothing from them, and it provides more support with Wish and Heal Bell. Protect is there mainly so that Blissey can use its own Wishes instead of always passing them, and Shed Shell is there to escape whatever trappers want to ruin my day.

Finally, RAW POWA.

Terrakion @ Choice Band
Ability: Justified
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Close Combat
- Stone Edge
- Quick Attack
- Iron Head

This set is an average choice band set, with more investment in speed to take out other choice sets and just kill faster in general. I can see exactly why this is probably a bad move, but I wanted to try it out anyway.


I haven't yet tried this out, mostly from being so afraid this is going to fail epicly and lack of experience. Thanks for reading through all of that, and for telling me exactly if/how my suspicions are correct.

Hi dude! Nice effort for a RMT, and I'll try to help! While scarf G-don can usually defeat a P-don 1 on 1, it really isn't worth a slot or the opportunity cost either. I'd suggest using a lead-don plus rocks, as you lack hazards.

My next improvement would be to give Shaymin a LO and give it a set change, for offense-orientated team support.

Now, my problem is that Lucario always kinda sucks, Blissey really isn't something you'd want on offense, and Garchomp and (arrarently) Terrakion aren't viable (I know, I was the one asking for an analysis). As such, I can't see a good team including any of them.

I'd suggest a Kyogre, to make a fire-water-grass core and help you out with some weaknesses. Darkrai is a strong offensive Mon too so that. Xerneas could help your team with setup. You also need an Arceus, so go E-killer. This team should be better, so good luck. Sorry for the drastic changes, I tried to keep Shaymin ;).

Groudon-Primal @ Red Orb
Ability: Desolate Land
EVs: 252 HP / 200 Def / 56 SpD
Relaxed Nature
- Stealth Rock
- Precipice Blades
- Lava Plume
- Thunder Wave

Shaymin-Sky @ Life Orb
Ability: Serene Grace
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 3 Atk
- Air Slash
- Seed Flare
- Healing Wish
- Hidden Power [Ice]

Kyogre-Primal @ Blue Orb
Ability: Primordial Sea
EVs: 248 HP / 248 Def / 12 Spe
Bold Nature
IVs: 0 Atk
- Rest
- Sleep Talk
- Scald
- Roar

Darkrai @ Life Orb
Ability: Bad Dreams
EVs: 4 Def / 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Dark Void
- Nasty Plot
- Dark Pulse
- Sludge Bomb

Xerneas @ Power Herb
Ability: Fairy Aura
EVs: 184 HP / 28 Def / 252 SpA / 44 Spe
Modest Nature
IVs: 0 Atk
- Geomancy
- Moonblast
- Focus Blast
- Thunder

Arceus @ Lum Berry
Ability: Multitype
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Swords Dance
- Extreme Speed
- Earthquake
- Shadow Claw


Standard sets. Consider scarf Shaymin instead.

Good Luck!

 

[YOLIT1]

before anything else I would suggest adding specifics to your descriptions, just saying 'several up there threats' and 'Psychic is there for coverage' doesn't allow people to understand your thought process when building. There also isn't any clear synergy between your team members.
About the actual team though, I'm sorry but many of the sets just aren't viable. Scarf don doesn't reliably check anything in the ORAS meta, and Psychic on Lucario is ironic since that moveslot is usually dedicated to priority to hit Darkrai. While rocky helmet chomp is a top tier mon in OU, it doesn't have many uses in Ubers. Terrak can be helpful in very specific situations, but it's niches are few enough that it was rejected for an analysis. Shoring up the sets would probably be a good first step, you can replace scarf don with a support pdon set with Stealth Rock. If you want to run special lucario, replace Psychic with Vacumn Wave, I recommend running Timid as well so you outspeed Latios. You lack an Arceus form which is mandatory a majority of the time in ORAS so if you're looking for something to sponge physical hits consider Waterceus; dragceus and groundceus are also options.

suggested sets

Groudon-Primal @ Red Orb
Ability: Desolate Land
EVs: 248 HP / 8 Atk / 252 SpD
Careful Nature
- Thunder Wave
- Precipice Blades
- Stealth Rock
- Dragon Tail/Stone Edge
(there are many different ev and moveslot options for the support set, this is just an example)

Lucario-Mega @ Lucarionite
Ability: Adaptability
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Nasty Plot
- Aura Sphere
- Flash Cannon
- Vacumn Wave

I honestly cannot believe I was stupid enough to forget that special priority exists for Lucario. That's been changed. About his ability, I honestly cannot decide between the extra power or the extra speed. My instincts say power, but they also said Scarf Groudon was a good idea, so maybe I won't be going with them. To be updated.

I'm hesitant to use Primal Groudon just because of how crazy powerful it is, which sounds stupid even to me. It's one of those things where you really don't like that something is the meta, but have to roll with it anyway. For now, I'll take your advice and switch it out for a Stealth Rock set, using those same moves and opting for Stone Edge. After a while of considering the EVs on my own, I eventually arrived to the same conclusion without even realizing it. Since two Stealth Rock users isn't really necessary, I'll drop Garchomp.

I did decide to go for an Arceus, and that's explained in the next response due to me opting for an Extreme Killer.

Thanks a million mate.

Hi dude! Nice effort for a RMT, and I'll try to help! While scarf G-don can usually defeat a P-don 1 on 1, it really isn't worth a slot or the opportunity cost either. I'd suggest using a lead-don plus rocks, as you lack hazards.

My next improvement would be to give Shaymin a LO and give it a set change, for offense-orientated team support.

Now, my problem is that Lucario always kinda sucks, Blissey really isn't something you'd want on offense, and Garchomp and (arrarently) Terrakion aren't viable (I know, I was the one asking for an analysis). As such, I can't see a good team including any of them.

I'd suggest a Kyogre, to make a fire-water-grass core and help you out with some weaknesses. Darkrai is a strong offensive Mon too so that. Xerneas could help your team with setup. You also need an Arceus, so go E-killer. This team should be better, so good luck. Sorry for the drastic changes, I tried to keep Shaymin ;).

Groudon-Primal @ Red Orb
Ability: Desolate Land
EVs: 252 HP / 200 Def / 56 SpD
Relaxed Nature
- Stealth Rock
- Precipice Blades
- Lava Plume
- Thunder Wave

Shaymin-Sky @ Life Orb
Ability: Serene Grace
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 3 Atk
- Air Slash
- Seed Flare
- Healing Wish
- Hidden Power [Ice]

Kyogre-Primal @ Blue Orb
Ability: Primordial Sea
EVs: 248 HP / 248 Def / 12 Spe
Bold Nature
IVs: 0 Atk
- Rest
- Sleep Talk
- Scald
- Roar

Darkrai @ Life Orb
Ability: Bad Dreams
EVs: 4 Def / 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Dark Void
- Nasty Plot
- Dark Pulse
- Sludge Bomb

Xerneas @ Power Herb
Ability: Fairy Aura
EVs: 184 HP / 28 Def / 252 SpA / 44 Spe
Modest Nature
IVs: 0 Atk
- Geomancy
- Moonblast
- Focus Blast
- Thunder

Arceus @ Lum Berry
Ability: Multitype
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Swords Dance
- Extreme Speed
- Earthquake
- Shadow Claw


Standard sets. Consider scarf Shaymin instead.

Good Luck!

Thanks for the detailed response :D

I took out Blissey, Garchomp, and Terrakion. Blissey because it was a long shot anyway, Garchomp for redundancy, and Terrakion from being advised to remove him twice.

I did add an Extreme Killer Arceus, and naturally it is similar to the one you provided. But, I opted for a Life Orb, put my 4 EVs to Special Defense, and went for the increase in power as opposed to speed.

I didn't switch up my Shaymin at all, because I REALLY like this set. I've used it in the past, and it worked out well despite looking weird. There's also the mental factor, in that I can't not run Earth Power, and I don't think I can play Healing Wish effectively.

Before I even move on, I will state that I'm wary of this no longer being my team anymore. I've now ousted half of it, ripped out 1/3 of my core, and changed all but one set in a major way. I do very much appreciate the feedback, but I fear this team losing what it was supposed to be in going any further.


That said, massive thanks to both of you. I will be updating the original post in a separate comment once I get to it, and continue to take what has already been said into account.

 

[Antacool]

Hi, nice RMT. I just have to say, consider keeping Terrakion with a choice scarf. Most competitive players in Ubers won't consider this pokemon a decent one. But trust me, I used it and peaked top ladder with. He helps against opposing threats who can give problems such as Yveltal, opposing Ekiller and Darkrai, the 2 lasts being top tiers threats atm. That means you can keep the modest nature on your skymin !
To be honest, Garchomp can be a cool lead. Put it stealth rock on it, earthquake, Stone edge and dragon tail, jolly max speed max attack, and focus sash, and you have a nice and original lead able to beat opposing Pdon in 2 hits and shuffle dragon defoggers with dtail.
Keep testing and building some original cores, you are not forced to use only standard sets and classic HO based Pokemon in your team.
Have a good luck for your battles and have a nice week-end.

 

[YOLIT1]

Hi, nice RMT. I just have to say, consider keeping Terrakion with a choice scarf. Most competitive players in Ubers won't consider this pokemon a decent one. But trust me, I used it and peaked top ladder with. He helps against opposing threats who can give problems such as Yveltal, opposing Ekiller and Darkrai, the 2 lasts being top tiers threats atm. That means you can keep the modest nature on your skymin !
To be honest, Garchomp can be a cool lead. Put it stealth rock on it, earthquake, Stone edge and dragon tail, jolly max speed max attack, and focus sash, and you have a nice and original lead able to beat opposing Pdon in 2 hits and shuffle dragon defoggers with dtail.
Keep testing and building some original cores, you are not forced to use only standard sets and classic HO based Pokemon in your team.
Have a good luck for your battles and have a nice week-end.

Thanks for the support mate. I've now remade the team, after a LONG time of trying to make it non-generic, and managed.

As of now, the Shaymin-S and Lucario-Mega sets are the same as the OP, minus trading Psychic for Vacuum Wave on Lucario, so I'll be ommiting them.

I managed to salvage my old core by doing Groudon a little different: Rock Polish sweeper.

Gaea (Groudon-Primal) @ Red Orb
Ability: Desolate Land
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Rock Polish
- Precipice Blades
- Stone Edge
- Fire Punch

This new set focuses on being fast, like really fast. I highly doubt it's as fast as the old set, but it certainly isn't a slouch. Precipice Blades and Stone Edge are there for the sheer power and coverage. Fire Punch is there for not only the surprise factor, but also because it's deceptively powerful factoring in sun and STAB, plus more coverage.

To replace Groudon's role as a Stealth Rocker, I added in an old favorite of mine.

Forretress @ Custap Berry
Ability: Sturdy
Shiny: Yes
EVs: 248 HP / 252 Def / 8 SpD
Impish Nature
- Stealth Rock
- Spikes
- Toxic Spikes
- Rapid Spin

This set hazard stacks like a boss. Leading off with Stealth Rock nearly guarantees that gets up factoring in Sturdy, then Custap Berry allows me to set up Toxic Spikes the next round if the opponent went for an attack. If Forretress is still alive or if I opt to just set up Stealth Rock, it come back with more hazard stacking and Rapid Spin.

The next new move is just a choiced nuke of a dragon, featuring Zekrom.

DarkKnight (Zekrom) @ Choice Band
Ability: Teravolt
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Outrage
- Bolt Strike
- Dragon Claw
- Volt Switch

It seems redundant, and my god it is. Unfortunately, there's not very much coverage if you're a Choice Band Zekrom nuke, and each move actually performs a legitimate function. Outrage is for raw power, and it doesn't really matter that it locks me into a move other than no switching. Bolt Strike is a standard spammable Electric STAB, and Dragon Claw is Outrage without the no switch & confusion thing, but with less power. Volt Switch is then used to pivot out, dealing damage and keeping momentum in the yada yada you get it moving on.

Last up is a toxic spreader and general slap in the face from Yveltal.

Yveltal @ Life Orb
Ability: Dark Aura
Shiny: Yes
EVs: 4 Def / 252 SpA / 252 Spe
Modest Nature
IVs: 0 Atk
- Toxic
- Oblivion Wing
- Dark Pulse
- Heat Wave

This set is mostly here for Toxic spreading, but while it's here I also added a life orb and a few attacks. Oblivion Wing will be the most spammable, because it's just that frigging good, and Dark Pulse forms dark STAB. Heat Wave is there for a bit of anti-steel coverage, nailing everything that is weak to it for super effective damage.

So, now we return to the what did I go wrong phase. Thanks for the existing support, and whatever is coming.

EDIT: At the request of another user, I am reposting the remainder of my team here for convenience.

Spearmint (Shaymin-Sky) @ Leftovers
Ability: Serene Grace
Shiny: Yes
EVs: 4 HP / 252 SpA / 252 Spe
Modest Nature
- Seed Flare
- Air Slash
- Earth Power
- Substitute

This set is based somewhat off of the popular SubSeed set, but instead of using Leech Seed I just opted for Leftovers and an extra coverage move. Other than using Earth Power for the extra coverage, it operates pretty much the same as usual.

For the third and final member of my core, I noticed that my team was weak to several pretty up there threats. This was done at a glance, since I've yet the patience to go deeper, but a good answer at the time looked like Mega Lucario.

Lucario-Mega @ Lucarionite
Ability: Adaptability
EVs: 4 Def / 252 SpA / 252 Spe
Modest Nature
- Nasty Plot
- Aura Sphere
- Flash Cannon
- Vacuum Wave

Did I mention it's not a physical set? Yeah... I made this one into a second special sweeper, this one based off of Nasty Plot. I put in Aura Sphere, but Focus Blast can also be run for the extra power. I decided against it for accuracy reasons, but still debate that. Flash Cannon is steel coverage and allows me to take on Xerneas pretty well, and Psychic is there for coverage.

 

[oversway]

For reference, it would be helpful if you reposted the entire team. Also, you're missing EVs on Forretress and pdon, I would suggest putting the remaining 4 into HP.

 

[YOLIT1]

For reference, it would be helpful if you reposted the entire team. Also, you're missing EVs on Forretress and pdon, I would suggest putting the remaining 4 into HP.

Fixed, thanks for the suggestion and the notice.

 

[oversway]

Alright, here are my suggestions:

• Change pdon to a support set. This gives you at least one way to deal with xern, which otherwise runs through your team at +2. Putting rocks on don also frees up the Forretress slot, which is unnecessary on this team, as common defoggers such as the lati twins and arceus forms can defog on a majority of your team. Forretress also has no way to break Sableye, which can switch in infinitely on it. Furthermore, you avoid being setup fodder for powerful physical attackers such as Mega Salamence and some ekiller variants.
• Change Modest Lucario to Timid. On the special set this is especially important since Vacumn Wave even at +6 fails to 3hko Latios. This also allows you to outspeed timid mega mence before it mega evolves.
• Change Modest Shaymin to Timid. Similar to above, this time running Timid over Modest allows you to outspeed Darkrai and SD groundceus, which otherwise breaks through your team like wet toliet paper.
• Replace Toxic on Yveltal with Sucker Punch. Not only are common Yveltal switchins such as Mega Diancie and Klefki are immune to Toxic, on the offensive set Sucker Punch provides more utility, as well as priority which your team otherwise lacks. It allows you to pick off Mega Salamence (although this often comes down to a 50/50) as well as weakened Xerneas and Latios. Knock Off and Foul Play are also options here, the former allowing you to rid Xerneas of it's item before it can set up, as well as hitting Ho-oh and the blobs harder, and the latter allowing you to hit Ho-oh as well while not allowing ekiller to set up on you. Also, changing the nature from Modest to Rash will keep the spatk boost while not lowering yveltal's atk, so Sucker will hit as hard as possible.
• Replace Forretress with Klefki. This gives you another Xern check, as well as a Lati check, which you otherwise struggle to take hits from. You don't lose hazard stacking utility however, as Klefki can carry spikes as well. It also beats most defoggers, such as the lati twins and most support arceus forms.
• Change EVs on Yveltal and Zekrom. Neither need max speed to outspeed and check key threats; Yveltal only needs enough for most support arceus, although running a bit more to outpace Timid Rayquaza and Kyurem-White is also an option, at the cost of power. Likewise, there isn't much Zekrom needs to outspeed at 252, although I'll leave that up to your discretion since some people run faster variants of Ho-oh and the two Primals.
• Finally, having a support arceus form is almost mandatory in ORAS, due to 120 stats across the board and capacities to act as both late game sweepers and bulky supports. I'll leave it up to you as how you want to fit one in, your team seems more geared towards offense so an SD arceus form would fit here, ekiller, groundceus, and ghostceus being common options. Ghostceus would probably work best here, since it offers a more reliable way to switch into ekiller as well as a weakened priority and decent offensive synergy with the rest of your team. If you don't mind running a more balanced team, a defog variant would also fit well, as two of your mons are worn down quickly if rocks are up on your side.

sets

Groudon-Primal @ Red Orb
Ability: Desolate Land
EVs: 248 HP / 32 Def / 200 SpD / 28 Spe
Careful Nature
- Precipice Blades
- Stone Edge
- Stealth Rock
- Roar

Lucario-Mega @ Lucarionite
Ability: Adaptability
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Nasty Plot
- Aura Sphere
- Flash Cannon
- Vacuum Wave

Spearmint (Shaymin-Sky) @ Leftovers
Ability: Serene Grace
Shiny: Yes
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Seed Flare
- Air Slash
- Earth Power
- Substitute

Yveltal @ Life Orb
Ability: Dark Aura
Shiny: Yes
EVs: 28 Def / 252 SpA / 228 Spe
Rash Nature
IVs: 0 Atk
- Sucker Punch/Knock Off/Foul Play
- Oblivion Wing
- Dark Pulse
- Heat Wave

Klefki @ Leftovers
Ability: Prankster
EVs: 248 HP / 8 Atk / 252 SpD
Careful Nature
- Play Rough/Flash Cannon (flash cannon if you feel Diancie is a major issue, in which case move the atk evs to spatk and run a Calm nature)
- Toxic
- Spikes
- Thunder Wave

Hope this works out for you!