This is a quick team I put together because I used the same Ubers team for such a long time, so I wanted to try something else. It started of as semi HO - basically always keep offensive momentum, whilst having a way to deal with every top threat (so I don't get absolutely destroyed by things like Geoxern, Scarf Ogre, Zekrom, Ekiller etc). I am using Mega Gengar even though it's likely to be banned soon.
THE (offensive) CORE
		
		
	
	
		 
	   
		 
	   
		 
	 
		 
	
This offensive core is built to be able to rip through stall, and has mons that support each other (e.g Gengar and Yveltal). Gengar is the MVP here, it's meant to take out the walls/threats that can stop either Xerneas, Yveltal or Ekiller from sweeping. As for checks to Geoxern - Xerneas, Gengar, Yveltal are all capable of putting all variants of Geoxern sets into KO range for Ekiller to finish. So note that Ekiller is basically my check to Geoxern.
GEOXERN
Xerneas @ Power Herb
Ability: Fairy Aura
EVs: 104 HP / 28 Def / 252 SpA / 124 Spe
Modest Nature
- Moonblast
- Geomancy
- Psyshock
- Hidden Power [Fire]
I have rarely ever used Xerneas in Ubers so I wanted to test it out. Of course having a mon that can rip through entire teams is wonderful, so I sort of built the core around this guy. I believe the EVs are the standard set on Geoxern, with 28 Def so Genesect can't get an Attack boost and OHKO it. 120 Speed is the standard Geoxern, so I ran 124 to ensure I can get off a Moonblast on opposing Xerneas so Ekiller can finish, or I can Geo before them of course and win. Moonblast and Geo are of course a given, as is HP Fire for Ferrothorn and Scizor. Psyshock over Thunder though is significant, as it tears apart Blissey, who can otherwise Toxic stall it, and Blissey (Shed Shell) can run from Gengar. Eviolite Chansey however can still tank Psyshock and Toxic Stall, but this doesn't matter because of Mega Gengar. So either way, the eggs do down.
MEGA GENGAR
Gengar-Mega @ Gengarite
Ability: Shadow Tag
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Sludge Wave
- Hidden Power [Fire]
- Taunt
- Destiny Bond
This guy supports Geoxern, as well as act as my stallbreaker. As I said before it takes out Chansey who stops Geoxern. Sludge Wave was the move I chose because it has more power than Shadow Ball with a nice poison chance. Also, it destroys Fairies, who Yveltal lures in. HP Fire is there for Scizor. It's common for Scizor to attempt to Pursuit trap Gengar, so I took advantage of this. Scizor and Mega Scizor are checks to Geoxern, with HP Fire, I can OHKO normal Scizor while having a good chance to KO Mega after rocks. Mega Gengar does live Bullet Punch. HP Fire also takes out Skarmory who can stop an Ekiller sweep, while doing a good chunk to Ferrothorn who COULD potentially be problematic. Destiny Bond is a sort of 50/50 Ekiller check, and of course to take out any threat with itself.
YGOD
Yveltal @ Life Orb
Ability: Dark Aura
EVs: 8 Atk / 248 SpA / 252 Spe
Hasty Nature
- Dark Pulse
- Oblivion Wing
- Sucker Punch
- Taunt
This guy is my second stallbreaker, and a good partner for Mega Gengar as it lures in Fairies who can then be dealt with by Mega Gengar. I ran max speed to outspeed other Yveltal as well as Rayquaza, Kyurem etc. I don't find the small power drop too much a difference. Dark Pulse, Obv Wing, Sucker Punch are obvious choices, and Taunt to stall break. Stall can't play around it too thanks to Oblivion Wing, so it has staying power. It's extremely strong priority in Sucker Punch stops a potential sweep, and does a huge chunk to Scarf Ogre (60-70 percent). Ekiller can finish off at this range.
EKILLER
Arceus @ Silk Scarf
Ability: Multitype
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- ExtremeSpeed
- Swords Dance
- Earthquake
- Shadow Claw
As I've said quite a few times, this guy is my last ditch sweep stopper and also my check to Geoxern. It's the last part of the offensive core and is capable of destroying entire teams. Mons like defensive Groudon who stop Ekiller from sweeping are taken down by Mega Gengar's Dbond. Ghostceus with Will-o-Wisp and Gira forms are destroyed by Yveltal. I ran Silk Scarf because I hate Life Orb recoil, and didn't like giving opponents the chance to play around Ekiller and wear it down with LO recoil. Earthquake and Shadow Claw are the coverage that fits this team best.
That's my offensive core built to support each other well, just to reiterate:
Supporting Geoxern - Gengar takes out Scizor who commonly tries to Pursuit trap. Takes out Chansey who can wall Geoxern. Aegislash is destroyed by Yveltal, and the set that is built to check Xern allows for free set up on Ekiller. It is then destroyed by EQ. Arceus Poison and Klefki can be problematic though.
Supporting Ekiller - Gengar takes out mons like Skarmory and Scizor who is occasionally used as an Ekiller check. Takes out Groudon with Dbond or even HP Fire depending on Groudon's HP. Arceus Ghost and Giratina and destroyed by Yveltal. And given my opponent will likely switch, not many things switch into Yveltal safely.
It's probably obvious by now that this is an offensive team, but I added two mons to take out flaws such as weaknesses to Scarf Ogre, Zekrom and Ekiller. These mons were Ferrothorn and Giratina-O. However, although they can patch up weakness, they make my teamstyle "Balance" which is pretty terrible in Ubers, and are counter productive to keeping offensive momentum. As such they lose a lot of momentum and can be mediocre. Their sets:
EDIT: Gira and Ferro have been replaced.
				
			THE (offensive) CORE
This offensive core is built to be able to rip through stall, and has mons that support each other (e.g Gengar and Yveltal). Gengar is the MVP here, it's meant to take out the walls/threats that can stop either Xerneas, Yveltal or Ekiller from sweeping. As for checks to Geoxern - Xerneas, Gengar, Yveltal are all capable of putting all variants of Geoxern sets into KO range for Ekiller to finish. So note that Ekiller is basically my check to Geoxern.
GEOXERN
Xerneas @ Power Herb
Ability: Fairy Aura
EVs: 104 HP / 28 Def / 252 SpA / 124 Spe
Modest Nature
- Moonblast
- Geomancy
- Psyshock
- Hidden Power [Fire]
I have rarely ever used Xerneas in Ubers so I wanted to test it out. Of course having a mon that can rip through entire teams is wonderful, so I sort of built the core around this guy. I believe the EVs are the standard set on Geoxern, with 28 Def so Genesect can't get an Attack boost and OHKO it. 120 Speed is the standard Geoxern, so I ran 124 to ensure I can get off a Moonblast on opposing Xerneas so Ekiller can finish, or I can Geo before them of course and win. Moonblast and Geo are of course a given, as is HP Fire for Ferrothorn and Scizor. Psyshock over Thunder though is significant, as it tears apart Blissey, who can otherwise Toxic stall it, and Blissey (Shed Shell) can run from Gengar. Eviolite Chansey however can still tank Psyshock and Toxic Stall, but this doesn't matter because of Mega Gengar. So either way, the eggs do down.
MEGA GENGAR
Gengar-Mega @ Gengarite
Ability: Shadow Tag
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Sludge Wave
- Hidden Power [Fire]
- Taunt
- Destiny Bond
This guy supports Geoxern, as well as act as my stallbreaker. As I said before it takes out Chansey who stops Geoxern. Sludge Wave was the move I chose because it has more power than Shadow Ball with a nice poison chance. Also, it destroys Fairies, who Yveltal lures in. HP Fire is there for Scizor. It's common for Scizor to attempt to Pursuit trap Gengar, so I took advantage of this. Scizor and Mega Scizor are checks to Geoxern, with HP Fire, I can OHKO normal Scizor while having a good chance to KO Mega after rocks. Mega Gengar does live Bullet Punch. HP Fire also takes out Skarmory who can stop an Ekiller sweep, while doing a good chunk to Ferrothorn who COULD potentially be problematic. Destiny Bond is a sort of 50/50 Ekiller check, and of course to take out any threat with itself.
YGOD
Yveltal @ Life Orb
Ability: Dark Aura
EVs: 8 Atk / 248 SpA / 252 Spe
Hasty Nature
- Dark Pulse
- Oblivion Wing
- Sucker Punch
- Taunt
This guy is my second stallbreaker, and a good partner for Mega Gengar as it lures in Fairies who can then be dealt with by Mega Gengar. I ran max speed to outspeed other Yveltal as well as Rayquaza, Kyurem etc. I don't find the small power drop too much a difference. Dark Pulse, Obv Wing, Sucker Punch are obvious choices, and Taunt to stall break. Stall can't play around it too thanks to Oblivion Wing, so it has staying power. It's extremely strong priority in Sucker Punch stops a potential sweep, and does a huge chunk to Scarf Ogre (60-70 percent). Ekiller can finish off at this range.
EKILLER
Arceus @ Silk Scarf
Ability: Multitype
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- ExtremeSpeed
- Swords Dance
- Earthquake
- Shadow Claw
As I've said quite a few times, this guy is my last ditch sweep stopper and also my check to Geoxern. It's the last part of the offensive core and is capable of destroying entire teams. Mons like defensive Groudon who stop Ekiller from sweeping are taken down by Mega Gengar's Dbond. Ghostceus with Will-o-Wisp and Gira forms are destroyed by Yveltal. I ran Silk Scarf because I hate Life Orb recoil, and didn't like giving opponents the chance to play around Ekiller and wear it down with LO recoil. Earthquake and Shadow Claw are the coverage that fits this team best.
That's my offensive core built to support each other well, just to reiterate:
Supporting Geoxern - Gengar takes out Scizor who commonly tries to Pursuit trap. Takes out Chansey who can wall Geoxern. Aegislash is destroyed by Yveltal, and the set that is built to check Xern allows for free set up on Ekiller. It is then destroyed by EQ. Arceus Poison and Klefki can be problematic though.
Supporting Ekiller - Gengar takes out mons like Skarmory and Scizor who is occasionally used as an Ekiller check. Takes out Groudon with Dbond or even HP Fire depending on Groudon's HP. Arceus Ghost and Giratina and destroyed by Yveltal. And given my opponent will likely switch, not many things switch into Yveltal safely.
It's probably obvious by now that this is an offensive team, but I added two mons to take out flaws such as weaknesses to Scarf Ogre, Zekrom and Ekiller. These mons were Ferrothorn and Giratina-O. However, although they can patch up weakness, they make my teamstyle "Balance" which is pretty terrible in Ubers, and are counter productive to keeping offensive momentum. As such they lose a lot of momentum and can be mediocre. Their sets:
EDIT: Gira and Ferro have been replaced.
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