This build takes the powerful face-to-face combination of Kangaskhan and Garchomp as its basic axis, adding Volcarona — which uses Will-O-Wisp to unlock the physical wall and type-matchup cycle that these two can't beat — along with the newly added Ditto and Mega Blastoise to maximize face-to-face pressure. Aegislash was adopted last to complete the team, to handle Primarina, which is especially troublesome for Mega Blastoise.
Early on, Mega Kangaskhan or Mega Blastoise is sent out first to seize the tempo, while Garchomp is built with more weight on firepower than defense, also carrying Stealth Rock so that it can pull its weight wherever it's thrown. Volcarona becomes an all-around sweeper once it stacks Quiver Dance, and neutralizes the opponent's physical attackers by spreading burns; when sending out Mega Blastoise, you must check in advance whether the opponent has Primarina and be ready with the option of countering with Aegislash.