In the process of teambuilding, a strong core is a key component to make the process easier, and give the team a good back bone. This thread will be used for the purpose of showing off some great cores! With Most Wanted and all these other tournaments about to start, feel free to post some cores that you've used or seen while building or watching tour games. You may like this thread to show off some cool mons that you put together, or just to steal some ideas for your own teambuilding, whatever works for you.
So what constitutes a good core?
An offensive core utilizes two or three Pokemon that are able to work together to break through whatever Pokemon the opponent is using, allowing the rest of the team to support those two Pokemon as the focal point. A good defensive core is a combination of two Pokemon that are able to switch into or check a good chunk of the offensive Pokemon in the meta, serving as the backbone of the team. Balanced cores a mix of these definitions, being able to check almost all Pokemon while still carrying some type of offensive presence.
Please label your core with the tag 'Offensive' / 'Balanced' or 'Stall' in bold so that I don't have to try and decide where your core goes, also, explain how your core works.
Examples:


Calyrex-Shadow @ Choice Specs
Ability: As One (Spectrier)
EVs: 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Astral Barrage
- Psyshock
- Draining Kiss
- Trick
Zacian-Crowned @ Rusted Sword
Ability: Intrepid Sword
EVs: 144 HP / 252 Atk / 112 Spe
Jolly Nature
- Play Rough
- Close Combat / Sword Dance
- Assurance
- Sword Dance / Wild Charge
Ability: As One (Spectrier)
EVs: 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Astral Barrage
- Psyshock
- Draining Kiss
- Trick
Zacian-Crowned @ Rusted Sword
Ability: Intrepid Sword
EVs: 144 HP / 252 Atk / 112 Spe
Jolly Nature
- Play Rough
- Close Combat / Sword Dance
- Assurance
- Sword Dance / Wild Charge


Yveltal @ Heavy-Duty Boots
Ability: Dark Aura
EVs: 248 HP / 8 Atk / 252 SpD
Careful Nature
- Knock Off
- Snarl
- Roost
- Defog
Necrozma-Dusk-Mane @ Rocky Helmet
Ability: Prism Armor
EVs: 252 HP / 4 Atk / 252 Def
Impish Nature
- Stealth Rock
- Morning Sun
- Sunsteel Strike
- Knock Off
Ability: Dark Aura
EVs: 248 HP / 8 Atk / 252 SpD
Careful Nature
- Knock Off
- Snarl
- Roost
- Defog
Necrozma-Dusk-Mane @ Rocky Helmet
Ability: Prism Armor
EVs: 252 HP / 4 Atk / 252 Def
Impish Nature
- Stealth Rock
- Morning Sun
- Sunsteel Strike
- Knock Off


Lugia @ Heavy-Duty Boots
Ability: Multiscale
EVs: 248 HP / 56 Def / 204 Spe
Bold Nature
IVs: 0 Atk
- Ice Beam
- Whirlwind
- Roost
- Toxic
Eternatus @ Black Sludge
Ability: Pressure
EVs: 252 HP / 240 SpD / 16 Spe
Timid Nature
IVs: 0 Atk
- Dynamax Cannon
- Flamethrower
- Toxic
- Recover
Ability: Multiscale
EVs: 248 HP / 56 Def / 204 Spe
Bold Nature
IVs: 0 Atk
- Ice Beam
- Whirlwind
- Roost
- Toxic
Eternatus @ Black Sludge
Ability: Pressure
EVs: 252 HP / 240 SpD / 16 Spe
Timid Nature
IVs: 0 Atk
- Dynamax Cannon
- Flamethrower
- Toxic
- Recover
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