Got two cores for ya
Mega Aerodactyl + Keldeo + Gengar
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This core is based around SubCM Keldeo, with Aero and Gengar helping support its sweep by destroying offense and trapping threats to the core and breaking fatter teams down,
respectively. Keldeo is the most important part of the core, as it checks a bunch of annoying stuff like Weavile, (Mega) Scizor, Tyranitar, Mega Sableye, Bisharp, Chansey/Blissey, Landorus-T, Gliscor, etc., all while setting up CMs and sweeping through teams pretty easily when its checks are gone. Pursuit Mega Aerodactyl supports the team by checking fast threats like (Mega) Alakazam, Talonflame, Mega Pinsir, Lati@s, Serperior, Gengar, Keldeo, Torn-T, Charizard X and Y, Mega Gallade, and so on. It also softens up stuff like Tentacruel and Rotom-Wash for the others to break through later. Gengar is an excellent wallbreaker and stallbreaker, so it fits the core nicely imo. It destroys stuff like Fairies, bulky Psychics, Rotom-Wash, etc., while stallbreaking easily with Taunt. Defensively, this core is weak to stuff like Sand, and BD Azumarill, so checks to them, such as Lando-T and Rotom-w, respectively, are recommended. Hazard removal is appreciated, too, from the likes of Latias.
Mega Altaria + Suicune + Talonflame
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This is a cool balanced core which is aimed to check a bunch of threats offensively and defensively, all while sweeping late game. DDD Mega Altaria checks stuff like Rotom-w, Thundurus, Keldeo, and Mega Slowbro, while supporting the team and itself with Heal Bell. Suicune checks loads of stuff too, like Mega Diancie, Excadrill, Talonflame, and Heatran, while phasing out other setup sweepers, like Unaware CM Clefable and CM Slowbro with Roar, which annoy this core otherwise. Talonflame is the final part of the core, and it checks stuff annoying to the core, like Mega Venusaur, Amoonguss, Gengar (offensively), Magnezone, etc.
Mega Aerodactyl + Keldeo + Gengar



This core is based around SubCM Keldeo, with Aero and Gengar helping support its sweep by destroying offense and trapping threats to the core and breaking fatter teams down,
respectively. Keldeo is the most important part of the core, as it checks a bunch of annoying stuff like Weavile, (Mega) Scizor, Tyranitar, Mega Sableye, Bisharp, Chansey/Blissey, Landorus-T, Gliscor, etc., all while setting up CMs and sweeping through teams pretty easily when its checks are gone. Pursuit Mega Aerodactyl supports the team by checking fast threats like (Mega) Alakazam, Talonflame, Mega Pinsir, Lati@s, Serperior, Gengar, Keldeo, Torn-T, Charizard X and Y, Mega Gallade, and so on. It also softens up stuff like Tentacruel and Rotom-Wash for the others to break through later. Gengar is an excellent wallbreaker and stallbreaker, so it fits the core nicely imo. It destroys stuff like Fairies, bulky Psychics, Rotom-Wash, etc., while stallbreaking easily with Taunt. Defensively, this core is weak to stuff like Sand, and BD Azumarill, so checks to them, such as Lando-T and Rotom-w, respectively, are recommended. Hazard removal is appreciated, too, from the likes of Latias.
Aerodactyl-Mega @ Aerodactylite
Ability: Tough Claws
EVs: 168 HP / 124 Atk / 216 Spe
Jolly Nature
- Aerial Ace
- Stone Edge
- Pursuit
- Fire Fang
Gengar @ Life Orb
Ability: Levitate
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 29 HP / 0 Atk
- Shadow Ball
- Sludge Wave
- Focus Blast
- Taunt
Keldeo-Resolute @ Leftovers
Ability: Justified
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Calm Mind
- Substitute
- Scald
- Secret Sword
Ability: Tough Claws
EVs: 168 HP / 124 Atk / 216 Spe
Jolly Nature
- Aerial Ace
- Stone Edge
- Pursuit
- Fire Fang
Gengar @ Life Orb
Ability: Levitate
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 29 HP / 0 Atk
- Shadow Ball
- Sludge Wave
- Focus Blast
- Taunt
Keldeo-Resolute @ Leftovers
Ability: Justified
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Calm Mind
- Substitute
- Scald
- Secret Sword



This is a cool balanced core which is aimed to check a bunch of threats offensively and defensively, all while sweeping late game. DDD Mega Altaria checks stuff like Rotom-w, Thundurus, Keldeo, and Mega Slowbro, while supporting the team and itself with Heal Bell. Suicune checks loads of stuff too, like Mega Diancie, Excadrill, Talonflame, and Heatran, while phasing out other setup sweepers, like Unaware CM Clefable and CM Slowbro with Roar, which annoy this core otherwise. Talonflame is the final part of the core, and it checks stuff annoying to the core, like Mega Venusaur, Amoonguss, Gengar (offensively), Magnezone, etc.
Suicune @ Leftovers
Ability: Pressure
EVs: 252 HP / 236 Def / 20 Spe
Bold Nature
IVs: 0 Atk
- Calm Mind
- Scald
- Rest
- Roar
Altaria-Mega @ Altarianite
Ability: Pixilate
Happiness: 0
EVs: 248 HP / 136 Def / 96 SpD / 28 Spe
Impish Nature
- Dragon Dance
- Frustration (you could use max happiness return but fuck ditto)
- Heal Bell
- Roost
Talonflame @ Sharp Beak
Ability: Gale Wings
EVs: 88 HP / 252 Atk / 168 Spe (this is the bulkier spread but max/max is fine)
Jolly Nature
- Swords Dance
- Brave Bird
- Flare Blitz
- Roost
Ability: Pressure
EVs: 252 HP / 236 Def / 20 Spe
Bold Nature
IVs: 0 Atk
- Calm Mind
- Scald
- Rest
- Roar
Altaria-Mega @ Altarianite
Ability: Pixilate
Happiness: 0
EVs: 248 HP / 136 Def / 96 SpD / 28 Spe
Impish Nature
- Dragon Dance
- Frustration (you could use max happiness return but fuck ditto)
- Heal Bell
- Roost
Talonflame @ Sharp Beak
Ability: Gale Wings
EVs: 88 HP / 252 Atk / 168 Spe (this is the bulkier spread but max/max is fine)
Jolly Nature
- Swords Dance
- Brave Bird
- Flare Blitz
- Roost
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