Taking as reference an Archaludon+Mimikyu+Basculegion core that another user shared, this was adopted as the matchup-oriented core, and Mega Blastoise, which has strong matchup performance, was added to it. Mega Delphox, with its high Speed and finishing power, was brought in to break through what would otherwise be a solid Dark-type answer, and the team was completed with a Metal Burst Kingambit adopted as the tool that stops Gyarados/Mimikyu mirror matches.
Archaludon is frequently used as the lead, boldly using even moves with unreliable accuracy, and Mimikyu's EVs were tuned to maintain solid matchup performance even without Trick Room. Blastoise has excellent matchup performance, but its selection rate was relatively low because it has clear natural predators such as Primarina and Dragonite.