Steven realizes that to awaken the Regis, all he needs are a Wailord and a Relicanth. Understanding his intention—to use them to stop Kyogre and Groudon—Sapphire shouts, summoning her Wailord and Relicanth. Marvelling at their good luck, Steven immediately performs the ritual to awaken the Regis, successfully awakening them.
Steven thinks back to a conversation he'd had with his father, in which his father told him that they must seal the Seafloor Cavern before Teams Aqua and Magma could use it to get Kyogre and Groudon, and for this purpose Mr. Stone is having the Kaien I built. If this plan failed, they would have to awaken the Regis. Very seriously, his father told Steven that everyone will have to play their part to save Hoenn.
Back in the present, the slab explodes in Steven's hands, its purpose fulfilled. Steven, overjoyed, reaches out to give Sapphire a hand in hauling her off his Metagross's leg and onto its back with him. Unfortunately, their hands slip and Sapphire is lost to the vortex of energy.