made by @Lacus Clyne and @cries in vain Primal-Kyogre + Xerneas Both share almost the exact same checks and the intention of this core should be obvious. You pressure your opponent to the point where he has to let his checks getting weakened and finish them off with your other Pokémon. Spoiler: Primal-Kyogre + Xerneas Kyogre @ Blue Orb Ability: Drizzle EVs: 172 HP / 252 SpA / 84 Spe Modest Nature IVs: 0 Atk - Origin Pulse - Calm Mind - Ice Beam - Thunder Xerneas @ Power Herb Ability: Fairy Aura EVs: 140 HP / 28 Def / 252 SpA / 48 Spe Modest Nature - Geomancy - Moonblast - Focus Blast - Hidden Power [Rock] Primal-Groudon + Klefki + Mega-Salamence It's a good core with defensive and offensive capabilities. Primal-Groudon can be used as a Stealth Rocker and checks threats like Xerneas or Primal-Kyogre, while Klefki checks somehow the threats Primal-Groudon is weak to. Finally Mega-Salamence is here to get rid of the ground type weakness and provide some solid offense. Spoiler: Primal-Groudon + Klefki + Mega-Salamence Groudon @ Red Orb Ability: Drought EVs: 248 HP / 8 Def / 252 SpD Sassy Nature - Stealth Rock - Earthquake - Lava Plume - Roar Klefki @ Leftovers Ability: Prankster EVs: 248 HP / 8 Def / 252 SpD Careful Nature - Play Rough - Thunder Wave - Toxic - Spikes Salamence @ Salamencite Ability: Intimidate EVs: 248 HP / 136 Def / 124 Spe Impish Nature - Return - Dragon Dance - Roost - Refresh Mega-Sableye + Arceus-Water + Lugia The most famous stall core in Ubers. Magic Bounce from Mega-Sableye can keep Stealth Rocks away to an extent and Lugia benefits from that by keeping Multiscale to tank a hit from every Pokémon. Lugia is the check to almost everything that is going to do damage and checks most of the time dragons like Mega-Salamence or Rayquaza. Arceus-Water is the defoger and checks Primal-Groudon and Ho-Oh. Spoiler: Mega Sableye + Lugia + Arceus-Water Sableye @ Sablenite Ability: Prankster EVs: 248 HP / 252 Def / 8 SpD Impish Nature - Fake Out - Will-O-Wisp - Recover - Foul Play Lugia @ Leftovers Ability: Multiscale EVs: 248 HP / 124 Def / 136 Spe Bold Nature IVs: 0 Atk - Ice Beam - Roost - Whirlwind - Toxic Arceus-Water @ Splash Plate Ability: Multitype EVs: 248 HP / 244 Def / 16 Spe Bold Nature IVs: 0 Atk - Judgment - Toxic - Defog - Recover Cloyster + Mega-Diancie A counterlead core against standard HO. It also has a good match-up against everything else. Cloyster sets up Toxic Spikes and antileads Deoxys-S with Rapid Spin. With Shell Smash Cloyster is able to provide some offense without getting set-up baited. Mega-Diancie checks Darkrai and is a solid switch-in against Mega-Sableye. Spoiler: Cloyster + Mega-Diancie Cloyster @ Focus Sash Ability: Skill Link EVs: 252 Atk / 4 Def / 252 Spe Jolly Nature - Icicle Spear - Shell Smash - Rapid Spin - Toxic Spikes Diancie @ Diancite Ability: Clear Body EVs: 80 Atk / 252 SpA / 176 Spe Naive Nature - Protect - Diamond Storm - Moonblast - Earth Power Rayquaza + Mega-Salamence Same scenario with Primal-Kyogre + Xerneas. Rayquaza and Mega-Salamence share the same checks and while one is doing some damage the other one is able to clean or create a path for a third party. Spoiler: Rayquaza + Mega-Salamence Rayquaza @ Choice Band Ability: Air Lock EVs: 252 Atk / 4 Def / 252 Spe Jolly Nature - Dragon Ascent - Extreme Speed - V-create - Aqua Tail Salamence @ Salamencite Ability: Intimidate EVs: 80 HP / 252 Atk / 176 Spe Adamant Nature - Double-Edge - Dragon Dance - Earthquake - Roost Rayquaza + Arceus-Ground Ok so the idea behind this is basically breaking Arceus-Ground checks with Rayquaza early/mid game so that SD Arceus-Ground can attempt a sweep later on or immediately after if the scenario is favorable this covers Primal-Groudon pretty well for an offensive build which is a massive lagniappe+Banded Rayquaza gives moderately powerful priority. Spoiler: Rayquaza + Arceus-Ground Rayquaza @ Choice Band Ability: Air Lock EVs: 252 Atk / 4 Def / 252 Spe Jolly Nature - Dragon Ascent - Extreme Speed - V-create - Aqua Tail Arceus-Ground @ Earth Plate Ability: Multitype EVs: 252 Atk / 4 Def / 252 Spe Jolly Nature - Swords Dance - Earthquake - Stone Edge - Recover + Arceus Dragon + Bronzong Arceus Dragon + Bronzong is a great core widely used in balanced teams. The first one is a solid defogger, Pdon check, sala/ray check , status spammer, and a safe-ish Ho Oh switch in. It is weak to fairy type obviously, and this is why it is paired with Bronzong, one of the most solid xern counters, which provides an amazing coverage for the core. Spoiler: Arceus-Dragon + Bronzong Arceus-Dragon @ Draco Plate Ability: Multitype EVs: 252 HP / 200 Def / 56 Spe Bold Nature - Judgment - Toxic - Defog - Recover Bronzong @ Leftovers Ability: Levitate EVs: 248 HP / 8 Atk / 252 SpD Sassy Nature IVs: 0 Spe - Gyro Ball - Toxic - Stealth Rock - Protect Ho-Oh + Giratina-Origin That's a great core for Bulky Offensive teams, Ho-Oh is a great counter to the threats Giratina is weak to (Xerneas, Clefable, Arceus-Fairy, Darkrai, Dialga etc). Giratina can always remove hazards and enter on Stone Edges with the great defense. Spoiler: Giratina-O + Ho-Oh Giratina-O @ Griseous Orb Trait: Levitate EVs: 252 Atk / 244 Def / 12 Spd Adamant Nature (+Atk, -SAtk) - Shadow Sneak - Earthquake - Defog - Dragon Tail Ho-Oh @ Choice Band Trait: Regenerator EVs: 248 HP / 204 Atk / 52 SDef / 4 Spd Adamant Nature (+Atk, -SAtk) - Sacred Fire - Brave Bird - Sleep Talk - Earthquake Ho-Oh + Mega-Gengar This is a solid offensive duo which could be dubbed as a core. It's a no brainer pretty much Mega-Gengar traps Ho-Oh checks and Ho-Oh ravages the rest of the team. Teams using Arceus-Rock are especially vulnerable to this core because the rest of the team is generally incredibly Ho-Oh weak and Mega-Gengar is usually used to take out support Arceus on teams so Ho-Oh has a field day or at least a much easier time picking apart the rest of the build. Spoiler: Ho-Oh + Mega-Gengar Ho-Oh @ Choice Band Ability: Regenerator EVs: 248 HP / 208 Atk / 52 SpD Adamant Nature - Brave Bird - Sacred Fire - Earthquake - Sleep Talk Gengar @ Gengarite EVs: 4 HP / 252 SpA / 252 Spe Timid Nature - Taunt - Destiny Bond - Sludge Wave - Shadow Ball / Focus Blast Darkrai + Mega Gengar This is an incredibly threatening offensive duo just because Darkrai has so few actually viable checks and the fact that Mega-Gengar can legit take out all of them (Scarf Xerneas/Klefki/Tyranitar/E-Killer(¿)/other random fairy Pokémon) is just ridiculous. This core threatens to fuck over Ho-Oh balance which is arguably the most consistent archetype in ORAS Ubers while not having a bad matchup versus anything in particular except Rock Polish Primal-Groudon I guess? Because you can't run Mega-Salamence as your mega now and Darkrai is only really viable on HO. But yeah this is a really solid offensive duo that can tear apart loads of common builds. Would appreciate some hazards up i guess. Spoiler: Darkrai + Mega-Gengar Darkrai @ Life Orb Ability: Bad Dreams EVs: 4 Def / 252 SpA / 252 Spe Timid Nature - Dark Void - Dark Pulse - Nasty Plot - Thunder Gengar @ Gengarite EVs: 4 HP / 252 SpA / 252 Spe Timid Nature - Taunt - Destiny Bond - Sludge Wave - Shadow Ball / Focus Blast Primal-Kyogre + Ho-Oh + Klefki Primal-Kyogre + Ho-Oh are really good at pressuring loads of bulky teams by dint of their sheer power this could be paired with a wincon and a certain degree of defensive synergy 2 further fuck up balance and stall. Klefki basically acts as glue and spikes are actually a big deal because of the massive number of switches Primal-Kyogre and Ho-Oh force which ends up really enervating the common builds used in the current meta and this is as good as it gets to checking darkrai well on balance. Spoiler: Primal-Kyogre + Ho-Oh + Klefki Kyogre @ Blue Orb Ability: Drizzle EVs: 172 HP / 252 SpA / 84 Spe Modest Nature IVs: 0 Atk - Origin Pulse - Calm Mind - Ice Beam - Thunder Ho-Oh @ Choice Band Ability: Regenerator EVs: 252 Atk / 252 Spe / 4 SpD Jolly Nature - Brave Bird - Sacred Fire - Earthquake - Sleep Talk Klefki @ Leftovers Ability: Prankster EVs: 248 HP / 8 Def / 252 SpD Careful Nature - Play Rough - Thunder Wave - Toxic - Spikes Giratina-O + Klefki So this is one common and really solid core. They cover each other weaknesses perfectly: Giratina checks Ground types, and most of the physical threats that annoy klefki (Ekiller,sd don etc) , while klefki covers the Dark/Dragon & Fairy weakness of Giratina. They both have access to status spamming or priority moves, while they also are a great pair of hazard controlling, since they have access to Spikes/Defog. The sets can vary depending on the team's playstyle. I have two sets for Tina, and the classic for the Klefki. Spoiler: Giratina + Klefki Giratina-O @ Griseous Orb Trait: Levitate EVs: 248 Atk / 248 Def / 12 Spd Adamant Nature - Earthquake / Shadow Force - Dragon Tail - Shadow Sneak - Defog Klefki @ Leftovers Ability: Prankster Shiny: Yes EVs: 248 HP / 8 Atk / 252 SpD Careful Nature - Play Rough - Spikes - Toxic - Thunder Wave Xerneas + Mega-Salamence This core has near perfect offensive synergy (Steel Pokemon + Primal Groudon being a common answer), while also improving defensive capabilities of a team. The duo can effectively break a team's backbone, opening holes for things like Ekiller to clean up. Flexible on Offense, Balanced, and Bulky Offense. Spoiler: Xerneas + Mega-Salamence Geomancy Xerneas Xerneas @ Power Herb Ability: Fairy Aura EVs: 148 HP / 28 Def / 252 SpA / 44 Spe Modest Nature - Geomancy - Moonblast - Aromatherapy - Hidden Power Ground DDD MMence Salamence @ Salamencite Ability: Intimidate EVs: 248 HP / 136 Def / 124 Spe Adamant Nature - Dragon Dance - Roost - Return - Refresh Standard MMence Salamence @ Salamencite Ability: Intimidate EVs: 80 HP / 252 Atk / 176 Spe Adamant Nature - Dragon Dance - Roost - Double-Edge - Facade Primal Groudon + Yveltal + Waterceus So this is a defensive core, capable to handle most of the threats in Oras. Primal Groudon, is here is set up some rocks, and check Xerneas (an yveltal answer) and Primal Kyogre as well. Yveltal is here to give an answer to E-killer,Salamence (a P.Don answer) or Rayquaza (a P.Don answer). Waterceus is here to provide checking to common threats as Ho Oh, Primal Groudon, Rockceus (a Yveltal answer) and more, while at the same time provide Defog. Spoiler: Primal Groudon + Yveltal + Arceus-Water Groudon @ Red Orb Ability: Drought EVs: 248 HP / 8 Def / 252 SpD Sassy Nature - Lava Plume / Stone Edge - Stealth Rock - Preciple Blades - Roar / Thunder Wave Yveltal @ Charti Berry/Rocky Helmet Ability: Dark Aura EVs: 248 HP / 252 Def / 8 Spe Impish Nature - Foul Play - Sucker Punch - Toxic/Taunt - Roost Arceus-Water @ Splash Plate Ability: Multitype EVs: 252 HP / 200 Def / 56 Spe Bold Nature IVs: 0 Atk - Defog - Ice Beam/Judgement - Toxic - Recover Ho-Oh + Arceus A great offensive core seen used a lot on ladder and tours. Ho-Oh can lure out mons and u can go into Ekiller, and also luring and beating mons like Shuca berry ttar. Ho-Oh also checks ghost mons like gengar. Having both ceus and ho-oh on the same team can easily handle geomancy Xerneas majority of the time. Using sleep talk on Ho-Oh helps when facing darkrai as well. You have different options on how u want to use Ho-Oh, u can use Choice Band, LO sleep talk, lefties, etc. Spoiler: Ho-Oh + Arceus Ho-Oh @ Life Orb Ability: Regenerator EVs: 248 HP / 196 Atk / 52 SpD / 16 Spe Adamant Nature - Brave Bird - Earthquake - Sacred Fire - Sleep Talk Arceus @ Life Orb Ability: Multitype EVs: 252 Atk / 4 Def / 252 Spd Jolly / Adamant Nature - Extreme Speed - Earthquake - Stone Edge / Shadow Claw - Swords Dance Mega-Diancie + Jirachi + Lugia This is a defensive core i really like as it checks a myriad of threats and also has wish support for Mega-Diancie while giving your team a nice cleric. Mega-Diancie and Lugia check Ho-Oh between them and other numerous threats like E-Killer / Dark types / Primal-Groudon/ Rayquaza / Mega-Salamence etcetera. Jirachi cockblocks Xerneas for the most part and hard checks the Lati-twins while spreading paralysis for something like Swords Dance Primal-Groudon to take advantage of. Strengthening the defensive backbone further would be recommended, although you can take a more offensive approach with 3 attacks Latios>Lugia and other E-Killer and Mega-Salamence checks. Spoiler: Mega-Diancie + Jirachi + Lugia Diancie @ Diancite Trait: Clear Body EVs: 248 HP / 160 Def / 100 Spd Impish Nature - Diamond Storm - Moonblast/Earth Power - Toxic - Heal Bell Jirachi @ Leftovers Trait: Serene Grace EVs: 252 HP / 240 SDef / 16 Spd Careful Nature - Iron Head - Body Slam - Wish - Protect Lugia @ Leftovers Trait: Multiscale EVs: 248 HP / 160 Def / 100 Spd Bold Nature - Ice Beam - Toxic - Roost - Whirlwind You are free to suggest cores you like. We will accept or decline them after looking at them.