Jirachi @ Leftovers
Ability: Serene Grace
Shiny: Yes
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Calm Mind
- Psyshock
- Aura Sphere
- Wish / Thunderbolt
Mienshao @ Choice Scarf
Ability: Regenerator
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Close Combat
- Knock Off
- U-turn
- Toxic
Slowking @ Heavy-Duty Boots
Ability: Regenerator
Shiny: Yes
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
IVs: 0 Atk
- Scald
- Future Sight
- Psyshock
- Teleport
Ability: Serene Grace
Shiny: Yes
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Calm Mind
- Psyshock
- Aura Sphere
- Wish / Thunderbolt
Mienshao @ Choice Scarf
Ability: Regenerator
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Close Combat
- Knock Off
- U-turn
- Toxic
Slowking @ Heavy-Duty Boots
Ability: Regenerator
Shiny: Yes
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
IVs: 0 Atk
- Scald
- Future Sight
- Psyshock
- Teleport
Calm Mind Jirachi is an excellent breaker and cleaner with its all rounded stats and coverage. Scarf regenerator Mienshao really benefits it by helping to deal with fast threats like Terrakion and Lycanroc that you lose out on dealing with with Jirachi by not running Choice Scarf, bringing Jirachi in on Pokemon like Weezing-Galar for easy set up opportunities with U-turn, and being able to cripple Slowking with Toxic, letting Jirachi more easily break through it. Slowking really rounds off this pairing forming a Regenerator core with Mienshao, providing a check to Pokemon like Mienshao and Flygon for Jirachi, and being able to form a formidable wallbreaking combo with Mienshao with Future Sight + Teleport, enabling Jirachi to clean much easier.
Jirachi @ Choice Scarf
Ability: Serene Grace
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Iron Head
- U-turn
- Healing Wish
- Trick
Roserade @ Black Sludge
Ability: Natural Cure
Shiny: Yes
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Spikes
- Stun Spore
- Sludge Bomb
- Giga Drain / Leaf Storm
Ability: Serene Grace
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Iron Head
- U-turn
- Healing Wish
- Trick
Roserade @ Black Sludge
Ability: Natural Cure
Shiny: Yes
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Spikes
- Stun Spore
- Sludge Bomb
- Giga Drain / Leaf Storm
Choice Scarf Jirachi is an absolutely exceptional speed control option that fits on nearly all teams, thanks to its strong utility, checking massively dangerous threats like Terrakion and Lycanroc, and ability to easily break fatter teams with both Trick and Flinching + Team support. Spikes support pairs amazingly with Jirachi, to help wear down its switch-ins like Cobalion, Tentacruel, and non Boots Slowking. Roserade is an exceptionally noticeable partner for this however, pressuring a lot of Jirachi's checks that are brought in through U-turn like Slowking and Rotom-Wash, and providing Stun Spore support, making it even easier for Jirachi to break through teams with Iron Head, and being great at slowing opposing Choice Scarf Jirachi.
Lycanroc-Dusk @ Life Orb
Ability: Tough Claws
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Close Combat
- Crunch
- Stone Edge
- Accelerock
Skarmory @ Leftovers
Ability: Sturdy
EVs: 248 HP / 200 Def / 4 SpD / 56 Spe
Impish Nature
IVs: 0 Atk
- Whirlwind
- Brave Bird / Body Press
- Roost
- Spikes
Slowking @ Heavy-Duty Boots
Ability: Regenerator
EVs: 252 HP / 252 Def / 4 SpA
Bold Nature
IVs: 0 Atk
- Future Sight
- Scald
- Psyshock
- Teleport
Ability: Tough Claws
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Close Combat
- Crunch
- Stone Edge
- Accelerock
Skarmory @ Leftovers
Ability: Sturdy
EVs: 248 HP / 200 Def / 4 SpD / 56 Spe
Impish Nature
IVs: 0 Atk
- Whirlwind
- Brave Bird / Body Press
- Roost
- Spikes
Slowking @ Heavy-Duty Boots
Ability: Regenerator
EVs: 252 HP / 252 Def / 4 SpA
Bold Nature
IVs: 0 Atk
- Future Sight
- Scald
- Psyshock
- Teleport
All-Out-Attacker Lycanroc is an exceptionally dangerous wallbreaker and late game cleaner with its incredible speed and Tough Claws boosted coverage leaving it with very limited defensive counterplay. Future Sight + Teleport Slowking can further augment this by limiting its defensive counterplay even further, and making up for its poor bulk by giving it a lot more breaking opportunities. Spikes support from Skarmory is also exceptional for Lycanroc, helping to punish switches even further, while Skarmory also pairs nicely with Future Sight due to Whirlwind. Slowking and Skarmory in return also provide Lycanroc with a lot of useful defensive utility, helping to check revenge killers like Choice Scarf Jirachi, Keldeo, and Mienshao.
Slowking @ Heavy-Duty Boots
Ability: Regenerator
Shiny: Yes
EVs: 252 HP / 252 Def / 4 SpA
Bold Nature
IVs: 0 Atk
- Future Sight
- Teleport
- Scald
- Psyshock
Heracross @ Flame Orb
Ability: Guts
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Close Combat
- Facade
- Knock Off
- Swords Dance / Spikes
Ability: Regenerator
Shiny: Yes
EVs: 252 HP / 252 Def / 4 SpA
Bold Nature
IVs: 0 Atk
- Future Sight
- Teleport
- Scald
- Psyshock
Heracross @ Flame Orb
Ability: Guts
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Close Combat
- Facade
- Knock Off
- Swords Dance / Spikes
Future Sight + Teleport Slowking generally pairs well with any Fighting-type really, but Heracross is arguably the hardest for stall teams to run viable counterplay to, as even running Protect on multiple Pokemon like Blissey/Slowking to sponge the Future Sight turn just lets Heracross SD up and force a sack every single time. Heracross espcially loves Slowking giving it lots of opportunities to come in on Dark-types like Krookodile and TTar freely, and having its Guts activated immediately through Teleport, in return Slowking pivots into a lot of revenge killers for Heracross like Darmanitan, Brave Bird Skarmory, Noivern, and Jirachi.
Blissey @ Heavy-Duty Boots
Ability: Natural Cure
Shiny: Yes
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
- Soft-Boiled
- Teleport
- Seismic Toss
- Toxic
Starmie @ Life Orb
Ability: Analytic
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Hydro Pump
- Psyshock
- Thunderbolt
- Rapid Spin / Recover / Ice Beam
Ability: Natural Cure
Shiny: Yes
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
- Soft-Boiled
- Teleport
- Seismic Toss
- Toxic
Starmie @ Life Orb
Ability: Analytic
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Hydro Pump
- Psyshock
- Thunderbolt
- Rapid Spin / Recover / Ice Beam
Life Orb Starmie is an exceptional offensive Pokemon currently, able to check a lot of offensive threats like Terrakion, Keldeo, Mienshao, and Roserade, while having very little defensive counterplay outside of Celebi or good prediction. Blissey further augments this by inviting in lots of these Pokemon, and especially Fighting types that it hates, that Starmie takes advantage of, providing Starmie with many breaking opportunities, and checking Pokemon like Kyurem and Rotom-W for Starmie.
Pincurchin @ Terrain Extender
Ability: Electric Surge
Shiny: Yes
EVs: 252 HP / 4 Def / 252 SpA (or a bulkier spread if you like)
Quiet Nature
IVs: 0 Atk
- Spikes
- Recover / Memento
- Scald / Memento
- Rising Voltage
Raichu-Alola @ Life Orb / Magnet
Ability: Surge Surfer
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Nasty Plot
- Psychic / Psyshock
- Rising Voltage
- Grass Knot
Necrozma @ Electric Seed
Ability: Prism Armor
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Calm Mind
- Earth Power
- Stored Power
- Moonlight
Ability: Electric Surge
Shiny: Yes
EVs: 252 HP / 4 Def / 252 SpA (or a bulkier spread if you like)
Quiet Nature
IVs: 0 Atk
- Spikes
- Recover / Memento
- Scald / Memento
- Rising Voltage
Raichu-Alola @ Life Orb / Magnet
Ability: Surge Surfer
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Nasty Plot
- Psychic / Psyshock
- Rising Voltage
- Grass Knot
Necrozma @ Electric Seed
Ability: Prism Armor
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Calm Mind
- Earth Power
- Stored Power
- Moonlight
Core also works the same with Reuniclus instead of Necrozma.
With Rillaboom now risen to OU, Electric Terrain based cores are a lot more viable now, taking advantage of Alolan-Raichu's insane Speed stat and damage output with Surge Surfer + Rising Voltage, making it a formidable cleaner and breaker that can outspeed all forms of speed control in the tier, and the absolute danger that Electric Seed Necrozma (or Reuniclus if you'd prefer) poses, especially with the low usage of Haze Pokemon currently. Pincurchin is mandatory to set terrain, but can provide Spikes support for Raichu, and optionally Memento support to allow Raichu a set up opportunity to clean easily late game.
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