Groudon-Primal @ Leftovers  
Ability: Mold Breaker  
EVs: 240 HP / 252 Atk / 16 Spe  
Adamant Nature  
- Spore  
- King's Shield  
- Shell Smash  
- Thousand Arrows

Giratina @ Safety Goggles  
Ability: Prankster  
EVs: 248 HP / 252 Def / 8 Spe  
Bold Nature  
IVs: 0 Atk  
- Will-O-Wisp  
- Encore  
- Curse  
- Roost

Diancie-Mega @ Pixie Plate  
Ability: Mold Breaker  
EVs: 4 HP / 252 SpA / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Spore  
- Shell Smash  
- Judgment  
- Steam Eruption

Kyogre-Primal @ Shed Shell  
Ability: Wonder Guard  
EVs: 248 HP / 252 Def / 8 SpD  
Bold Nature  
- Scald  
- Defog  
- Aromatherapy  
- Recover

Xerneas @ Leftovers  
Ability: Wonder Guard  
EVs: 248 HP / 8 Def / 252 SpA  
Quiet Nature  
IVs: 0 Spe  
- Stealth Rock  
- Substitute  
- Moonblast  
- Baton Pass

Gyarados-Mega @ Lum Berry  
Ability: Huge Power  
EVs: 252 HP / 252 Atk / 4 Def  
Adamant Nature  
- Water Shuriken  
- Pursuit  
- Knock Off  
- Gastro Acid

Mold Breaker Diancie Balance

King's Shield Primal Groudon prevents most revenge-killers from reliably threatening it when boosted while still having perfect coverage in Thousand Arrows. Prankster Giratina Imposter-proofs Groudon and Diancie while also blanket checking physical threats and some special Shell Smash users. Mega Diancie complements Groudon well, threatening every Groudon check with longevity; it's also a fantastic sweeper in its own right and is easily Imposter-proofed by Giratina and Kyogre. Primal Kyogre soft-checks Groudon, can annoy offensive and defensive non-Wonder Guards alike with Scald, and acts as a Defogger and cleric for the team. SubPass Xerneas passes Substitutes and sets hazards with near impunity, as few Magic Bouncers like switching into it and many Mold Breakers fear Moonblast. Mega Gyarados is the revenge-killer, Pursuit trapping while threatening Groudon, Mega Tyranitar, boosted MMY, and Mega Gengar with Water Shuriken, and taking a hit from many special sweepers even after a Shell Smash. This team's extremely solid team that only really struggles with Scarf Shadow Tags, and managed to get to 1955 on the ORAS Hackmons ladder. For more information on this team check out this link: https://www.smogon.com/forums/threads/old-gen-hackmons-megathread.3649618/post-9194359

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