Turn 6:
Bahamut: Blast Seed Shield, Vile Seed Groudon
Nip: Triple Axel Groudon, Shadow Spike Groudon x2
Brisa: Chilly and Venom Seeds Groudon, Shadow Maul x2 Groudon
Astrid: (Recurve) Heal Bell Curio, two others that aren't Brisa (irrelevant), Iceberg, Hex x4 on Groudon
Curio: Shadow Malfunction Groudon x3
Celeste: Blast Seed Shield, Assurance x2 Groudon
Starr: Flare Blitz Groudon, flare Blitz Shield x2
Vix: Hex x2 on Groudon
Dave: Shadow Charge, then Assurance x2 on Groudon
Shiron: Compressed Earthquake and Shadow Malestrom on Groudon
Cabot: Stone Edge Groudon x3