Alright, I posted the RMT a few days ago. Time to dump the two cores that evolved from it:
Great Wall (Registeel) @ Leftovers
Ability: Clear Body
EVs: 248 HP / 8 Def / 252 SpD
Calm Nature
- Stealth Rock
- Seismic Toss
- Thunder Wave
- Protect
Fairy Wall (Aromatisse) (F) @ Leftovers
Ability: Aroma Veil
EVs: 248 HP / 240 Def / 20 SpD
Bold Nature
IVs: 0 Atk
- Aromatherapy
- Wish
- Protect
- Moonblast
BROKEN (Druddigon) (M) @ Assault Vest
Ability: Sheer Force
EVs: 248 HP / 240 Atk / 20 Spe
Adamant Nature
- Dragon Claw
- Fire Punch
- Sucker Punch
- Gunk Shot
This is a fantastic core, and a rather easy one to use. Between these 3, you get a reliable switch-in to just about every relevant threat in RU. Registeel is the most viable answer to Yanmega in the tier and it also checks a ton of offensive Pokemon in the tier, such as Braviary, Jolteon, and about any special attacker without a super effective STAB move. It sets Stealth Rock, spreads paralysis, scouts for moves, and S-Tosses whenever necessary. Aromatisse is a reliable switch-in to Hitmonlee, Zoroark, Sharpedo, and numerous others. With Registeel around, Aromatisse can focus on physical bulk and her better physical-based resistances. She provides Registeel with everything it could ask for in Wish and Cleric support while Moonblast is nice to nail those annoying Fighting- and Dark-types. Assault Vest Druddigon gives the core offensive potential while also covering for the severe issue the core has with Fire-types. Druddigon gets wide coverage and has a very solid Attack stat to back it up with. Thanks to the cleric and Wish support Aromatisse provides, Druddigon can be a bit more reckless while Registeel resists everything Druddigon is weak to. Aromatisse is even immune to Dragon! It's a great balance core that you really should try out if you haven't already. If you don't have a Water-type planned out for a team you plan on using Aromatisse + Registeel on, AV Slowking can be used over Druddigon for extra security vs. Fire-types.
Donk (Clawitzer) (M) @ Life Orb
Ability: Mega Launcher
EVs: 4 Def / 252 SpA / 252 Spe
Modest Nature
IVs: 0 Atk
- Scald
- Aura Sphere
- Dark Pulse
- Ice Beam
Pirouette (Meloetta) @ Choice Scarf
Ability: Serene Grace
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Hyper Voice
- Psychic
- U-turn
- Shadow Ball
JusticeV (Virizion) @ Lum Berry
Ability: Justified
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Swords Dance
- Leaf Blade
- Stone Edge
- Close Combat
This is a really cool offensive core. Clawitzer is something that is really underrated right now imo. It is able to, at worst, 2HKO nearly every common defensive Pokemon in RU with its incredible coverage and high Special Attack. Among the defensive Pokemon Clawitzer can at least 2HKO are Amoonguss, Alomomola, Registeel, Tangrowth, Bronzong, Druddigon, Gligar, and AV Slowking... yeah it 2HKOes AV Slowking with a non-STAB special attack. That's how strong this thing is. The drawback? It's slow as shit, barely outspeeding uninvested Gligar with full Speed investment, so don't expect it to do too hot vs. offense (though it will still usually get a kill) With a strong wallbreaker comes a reliable cleaner or two. That's where Meloetta and Virizion come in. Meloetta is a very unique Pokemon, being arguably the best Choice Scarf user in the tier that has access to a sound-based move. Why is this really cool? Sound-based moves hit through Substitute. This means that the Sub + Bulk Up Braviary that's about to finish your team is cut short, guaranteed, so long as it's in KO range. Same with Gallade, Moltres, and other such offensive Pokemon. Like any great Scarfer, Meloetta has access to one of U-turn or Volt Switch to scout for potential checks and counters to allow its teammates to do their thing. While Meloetta is more of a revenge killer and late-game cleaner, Virizion is strictly a sweeper. If bulky Ghosts and Psychics fail to survive Clawitzer's assaults, Virizion will usually be free to sweep once it gets a chance to set up, which can be easily obtained through Meloetta's U-turn due to its tendency to force in Dark-, Rock- and Steel-types to take on its STAB moves. After a single SD, Virizion is set to sweep with its good coverage and powerful STAB moves. Just take care to only use Close Combat when the extra power is necessary to KO a target. It's a solid offensive core that I recommend you try out.

Great Wall (Registeel) @ Leftovers
Ability: Clear Body
EVs: 248 HP / 8 Def / 252 SpD
Calm Nature
- Stealth Rock
- Seismic Toss
- Thunder Wave
- Protect

Fairy Wall (Aromatisse) (F) @ Leftovers
Ability: Aroma Veil
EVs: 248 HP / 240 Def / 20 SpD
Bold Nature
IVs: 0 Atk
- Aromatherapy
- Wish
- Protect
- Moonblast

BROKEN (Druddigon) (M) @ Assault Vest
Ability: Sheer Force
EVs: 248 HP / 240 Atk / 20 Spe
Adamant Nature
- Dragon Claw
- Fire Punch
- Sucker Punch
- Gunk Shot
This is a fantastic core, and a rather easy one to use. Between these 3, you get a reliable switch-in to just about every relevant threat in RU. Registeel is the most viable answer to Yanmega in the tier and it also checks a ton of offensive Pokemon in the tier, such as Braviary, Jolteon, and about any special attacker without a super effective STAB move. It sets Stealth Rock, spreads paralysis, scouts for moves, and S-Tosses whenever necessary. Aromatisse is a reliable switch-in to Hitmonlee, Zoroark, Sharpedo, and numerous others. With Registeel around, Aromatisse can focus on physical bulk and her better physical-based resistances. She provides Registeel with everything it could ask for in Wish and Cleric support while Moonblast is nice to nail those annoying Fighting- and Dark-types. Assault Vest Druddigon gives the core offensive potential while also covering for the severe issue the core has with Fire-types. Druddigon gets wide coverage and has a very solid Attack stat to back it up with. Thanks to the cleric and Wish support Aromatisse provides, Druddigon can be a bit more reckless while Registeel resists everything Druddigon is weak to. Aromatisse is even immune to Dragon! It's a great balance core that you really should try out if you haven't already. If you don't have a Water-type planned out for a team you plan on using Aromatisse + Registeel on, AV Slowking can be used over Druddigon for extra security vs. Fire-types.

Donk (Clawitzer) (M) @ Life Orb
Ability: Mega Launcher
EVs: 4 Def / 252 SpA / 252 Spe
Modest Nature
IVs: 0 Atk
- Scald
- Aura Sphere
- Dark Pulse
- Ice Beam

Pirouette (Meloetta) @ Choice Scarf
Ability: Serene Grace
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Hyper Voice
- Psychic
- U-turn
- Shadow Ball

JusticeV (Virizion) @ Lum Berry
Ability: Justified
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Swords Dance
- Leaf Blade
- Stone Edge
- Close Combat
This is a really cool offensive core. Clawitzer is something that is really underrated right now imo. It is able to, at worst, 2HKO nearly every common defensive Pokemon in RU with its incredible coverage and high Special Attack. Among the defensive Pokemon Clawitzer can at least 2HKO are Amoonguss, Alomomola, Registeel, Tangrowth, Bronzong, Druddigon, Gligar, and AV Slowking... yeah it 2HKOes AV Slowking with a non-STAB special attack. That's how strong this thing is. The drawback? It's slow as shit, barely outspeeding uninvested Gligar with full Speed investment, so don't expect it to do too hot vs. offense (though it will still usually get a kill) With a strong wallbreaker comes a reliable cleaner or two. That's where Meloetta and Virizion come in. Meloetta is a very unique Pokemon, being arguably the best Choice Scarf user in the tier that has access to a sound-based move. Why is this really cool? Sound-based moves hit through Substitute. This means that the Sub + Bulk Up Braviary that's about to finish your team is cut short, guaranteed, so long as it's in KO range. Same with Gallade, Moltres, and other such offensive Pokemon. Like any great Scarfer, Meloetta has access to one of U-turn or Volt Switch to scout for potential checks and counters to allow its teammates to do their thing. While Meloetta is more of a revenge killer and late-game cleaner, Virizion is strictly a sweeper. If bulky Ghosts and Psychics fail to survive Clawitzer's assaults, Virizion will usually be free to sweep once it gets a chance to set up, which can be easily obtained through Meloetta's U-turn due to its tendency to force in Dark-, Rock- and Steel-types to take on its STAB moves. After a single SD, Virizion is set to sweep with its good coverage and powerful STAB moves. Just take care to only use Close Combat when the extra power is necessary to KO a target. It's a solid offensive core that I recommend you try out.