This team might be a little misaligned with the current ubers metagame, but I figure it might be worth digging up for your scrutiny/enjoyment. In the early days of XY Ubers, threats like Mega-Blaziken and Geomancy Xerneas were running amok, threatening to sweep with impunity. Though Mega-Blaziken has fallen a bit out of favor, every team must still have a Xerneas check. I take that one step further in my answer to Xerneas- I force it to either waste its Geomancy and switch out, or be crippled and killed outright. Peaked at ~100th on ladder.
Lead Kyogre or Giratina or Ho-oh at your discretion.
Importable:
Lead Kyogre or Giratina or Ho-oh at your discretion.
The Trap Card/Flinchy the Jirachi
Flinchy (Jirachi) @ Leftovers
Ability: Serene Grace
EVs: 252 HP / 224 SDef / 32 Spd
Careful Nature
- Iron Head
- Thunder Wave
- Wish
- Stealth Rock
For me, specially defensive Jirachi is the premier answer to Xerneas. If you can switch in with at least 50% health on the same turn that Xerneas commits to using Geomancy, you can cripple it with Thunder Wave while living any attack that Xerneas can be expected to have. Iron head and serene grace paraflinch should take care of the rest if they choose to stay in. Added utility in the form of Stealth Rock and Wish provides support for the rest of the team. Steel typing gives Jirachi immunity to toxic. Careful switching allows this team to have longevity when it comes to playing against stall teams.
The Priority/The Phazer
Weeeee....! (Giratina-Origin) @ Griseous Orb
Ability: Levitate
EVs: 4 SDef / 164 HP / 252 Atk / 4 Def / 84 Spd
Adamant Nature
- Earthquake
- Dragon Tail
- Shadow Sneak
- Will-O-Wisp
Giratina-O, while having some offensive capability (2HKOing both Mega-Mewtwo forms with Shadow Sneak), is a check against Blaziken and Extreme Killer Arceus, being able to Dragon Tail, or more ideally, Will-O-Wisp the latter. Earthquake is a 1HKO against both Blaziken and Mega-Blaziken, and Giratina-O at full health survives a +2 Knock Off from Mega Blaziken. Lum Berry Extreme Killer with Shadow Claw can prove sometimes to be problematic; however, it is best in that case simply to Will-O-Wisp twice. Dragon Tail, though having negative priority, is a STAB move, and with good prediction, can deal significant damage to Kyogre or Giratina-Altered that switch in. Furthermore, a great many people like to switch in Xerneas on Giratina-O, thinking it an opportunity to use Geomancy for free, when in reality, there is a Jirachi waiting in the wings.
Scarf Kyogre
Dory (Kyogre) @ Choice Scarf
Ability: Drizzle
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature
- Water Spout
- Scald
- Ice Beam
- Thunder
Scarf Kyogre is one of the deadliest sweepers in the metagame. It 1HKOs nearly everything that doesn't resist it. Furthermore, rain allows an easier switch in for Jirachi, weakening the power of Fire. Against less experienced players, simply having Scarf Kyogre often wins the game outright. Mega Kangaskhan and Extreme Killer Arceus do a very great deal of damage against Kyogre, though.
The Regenerator
...Moltres? (Ho-Oh) @ Leftovers
Ability: Regenerator
EVs: 248 HP / 176 Atk / 84 SDef
Adamant Nature
- Sacred Fire
- Brave Bird
- Roost
- Earthquake
There isn't any Heal Bell or Aromatherapy on this team, so Regenerator Ho-oh can act as a stand-in for absorbing Toxic. Brave Bird can take a big chunk out of Kyogre and most anything that switches into it. Sacred Fire, with its 50% chance to burn, is great at making physical attackers not want to switch into this guy. 4x weakness to Stealth Rock is its only drawback.
The Fairy
Fairy Princess (Arceus-Fairy) @ Pixie Plate
Ability: Multitype
EVs: 252 HP / 4 SAtk / 252 SDef
Calm Nature
- Judgment
- Will-O-Wisp
- Defog
- Recover
Because of the frequency and strength of dragon-types in Ubers, monoattacking Fairy Arceus seems to be a good choice. I swapped out Calm Mind for Defog in order to have some hazard-clearing ability, boosting Ho-oh's longevity. Recover allows for reliable recovery, and Will-o-Wisp gives it a chance to take down Extreme Killer.
The Mega
Rocky (Kangaskhan-Mega) @ Kangaskhanite
Ability: Parental Bond
EVs: 252 Atk / 4 SDef / 252 HP
Adamant Nature
- Sucker Punch
- Crunch
- Return
- Power-Up Punch
Rather than opting for speed EVs, I place my Mega Kangaskhan's investment into HP. While +2 extreme killer will still most likely 1hko it, there's at least a chance of getting some hits in return. Good prediction, at any rate, serves better than hoping to outspeed the opponent. After reaching +2, Crunch enables Mega Kangaskhan to break down walls like Lugia or Giratina.
Flinchy (Jirachi) @ Leftovers
Ability: Serene Grace
EVs: 252 HP / 224 SDef / 32 Spd
Careful Nature
- Iron Head
- Thunder Wave
- Wish
- Stealth Rock
For me, specially defensive Jirachi is the premier answer to Xerneas. If you can switch in with at least 50% health on the same turn that Xerneas commits to using Geomancy, you can cripple it with Thunder Wave while living any attack that Xerneas can be expected to have. Iron head and serene grace paraflinch should take care of the rest if they choose to stay in. Added utility in the form of Stealth Rock and Wish provides support for the rest of the team. Steel typing gives Jirachi immunity to toxic. Careful switching allows this team to have longevity when it comes to playing against stall teams.
The Priority/The Phazer
Weeeee....! (Giratina-Origin) @ Griseous Orb
Ability: Levitate
EVs: 4 SDef / 164 HP / 252 Atk / 4 Def / 84 Spd
Adamant Nature
- Earthquake
- Dragon Tail
- Shadow Sneak
- Will-O-Wisp
Giratina-O, while having some offensive capability (2HKOing both Mega-Mewtwo forms with Shadow Sneak), is a check against Blaziken and Extreme Killer Arceus, being able to Dragon Tail, or more ideally, Will-O-Wisp the latter. Earthquake is a 1HKO against both Blaziken and Mega-Blaziken, and Giratina-O at full health survives a +2 Knock Off from Mega Blaziken. Lum Berry Extreme Killer with Shadow Claw can prove sometimes to be problematic; however, it is best in that case simply to Will-O-Wisp twice. Dragon Tail, though having negative priority, is a STAB move, and with good prediction, can deal significant damage to Kyogre or Giratina-Altered that switch in. Furthermore, a great many people like to switch in Xerneas on Giratina-O, thinking it an opportunity to use Geomancy for free, when in reality, there is a Jirachi waiting in the wings.
Scarf Kyogre
Dory (Kyogre) @ Choice Scarf
Ability: Drizzle
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature
- Water Spout
- Scald
- Ice Beam
- Thunder
Scarf Kyogre is one of the deadliest sweepers in the metagame. It 1HKOs nearly everything that doesn't resist it. Furthermore, rain allows an easier switch in for Jirachi, weakening the power of Fire. Against less experienced players, simply having Scarf Kyogre often wins the game outright. Mega Kangaskhan and Extreme Killer Arceus do a very great deal of damage against Kyogre, though.
The Regenerator
...Moltres? (Ho-Oh) @ Leftovers
Ability: Regenerator
EVs: 248 HP / 176 Atk / 84 SDef
Adamant Nature
- Sacred Fire
- Brave Bird
- Roost
- Earthquake
There isn't any Heal Bell or Aromatherapy on this team, so Regenerator Ho-oh can act as a stand-in for absorbing Toxic. Brave Bird can take a big chunk out of Kyogre and most anything that switches into it. Sacred Fire, with its 50% chance to burn, is great at making physical attackers not want to switch into this guy. 4x weakness to Stealth Rock is its only drawback.
The Fairy
Fairy Princess (Arceus-Fairy) @ Pixie Plate
Ability: Multitype
EVs: 252 HP / 4 SAtk / 252 SDef
Calm Nature
- Judgment
- Will-O-Wisp
- Defog
- Recover
Because of the frequency and strength of dragon-types in Ubers, monoattacking Fairy Arceus seems to be a good choice. I swapped out Calm Mind for Defog in order to have some hazard-clearing ability, boosting Ho-oh's longevity. Recover allows for reliable recovery, and Will-o-Wisp gives it a chance to take down Extreme Killer.
The Mega
Rocky (Kangaskhan-Mega) @ Kangaskhanite
Ability: Parental Bond
EVs: 252 Atk / 4 SDef / 252 HP
Adamant Nature
- Sucker Punch
- Crunch
- Return
- Power-Up Punch
Rather than opting for speed EVs, I place my Mega Kangaskhan's investment into HP. While +2 extreme killer will still most likely 1hko it, there's at least a chance of getting some hits in return. Good prediction, at any rate, serves better than hoping to outspeed the opponent. After reaching +2, Crunch enables Mega Kangaskhan to break down walls like Lugia or Giratina.
Importable:
Code:
Rocky (Kangaskhan-Mega) @ Kangaskhanite
Ability: Parental Bond
EVs: 252 Atk / 4 SDef / 252 HP
Adamant Nature
- Sucker Punch
- Crunch
- Return
- Power-Up Punch
Fairy Princess (Arceus-Fairy) @ Pixie Plate
Ability: Multitype
EVs: 252 HP / 4 SAtk / 252 SDef
Calm Nature
- Judgment
- Will-O-Wisp
- Defog
- Recover
Flinchy (Jirachi) @ Leftovers
Ability: Serene Grace
EVs: 252 HP / 224 SDef / 32 Spd
Careful Nature
- Iron Head
- Thunder Wave
- Wish
- Stealth Rock
...Moltres? (Ho-Oh) @ Leftovers
Ability: Regenerator
EVs: 248 HP / 176 Atk / 84 SDef
Adamant Nature
- Sacred Fire
- Brave Bird
- Roost
- Earthquake
Weeeee....! (Giratina-Origin) @ Griseous Orb
Ability: Levitate
EVs: 4 SDef / 164 HP / 252 Atk / 4 Def / 84 Spd
Adamant Nature
- Earthquake
- Dragon Tail
- Shadow Sneak
- Will-O-Wisp
Dory (Kyogre) @ Choice Scarf
Ability: Drizzle
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature
- Water Spout
- Scald
- Ice Beam
- Thunder