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In the {{chap|Omega Ruby & Alpha Sapphire}}, [[Professor Cozmo]] discovers that a meteoroid will crash into the Hoenn region, which will destroy everything. To counter this disaster, Steven enlists the help of Ruby, Sapphire, and {{LGA|Smeraldo}}. Steven has [[Eccelia]] train the three Pokédex holders' starter Pokémon in mastering the ultimate moves so that they may be prepared to use Mega Evolution. Due to Ruby having business elsewhere at the time, Steven trains Ruby's [[Mumu]] in his place. Eventually, the three Pokémon master the ultimate moves, but with Ruby still having not returned, only [[Torcia]] and {{TP|Smeraldo|Sceptile}} are able to Mega Evolve. Despite this, Mr. Stone orders to move onto the next stage of the plan without Ruby.
In ''[[PS601|Omega Alpha Adventure 5]]'', the group travels to [[Sea Mauville]], an abandoned energy harvesting plant owned by a rival company of Devon's. The plant contained a machine known as the [[ultimate weapon|Absorber]] that will power a dimensional shifter so that the meteoroid will be dealt with. That night, Smeraldo is attacked by a mischievous [[Hoopa]]. Steven assists Emerald in battling the Pokémon and reveals that he can use Mega Evolution as well. They battle the Pokémon together, but it escapes before they can defeat or identify its identity.
The next day, Steven and Mr. Stone begin to use the Absorber to drain Emerald's Sceptile and Sapphire's Chic in their Mega-Evolved states. The process hurts their Pokémon intensely, causing their Trainers to be horrified. After the process is finished, they are attacked by [[Zinnia]], a [[Draconid people|Draconid]] with a hatred for the Devon Corporation. She attacks with her small army of former Team Magma and Aqua Grunts to destroy the dimensional shifter that was powered by Sceptile and Chic's energy. Steven Mega Evolves his Metagross to assist his allies in protecting the shifter from being destroyed. After some time, Ruby returns to try and convince Zinnia to stop the battle, only to learn that Sapphire and the shifter had disappeared. With the shifter gone, Zinnia decides to turn her attention to Steven and steal his Key Stone. Ruby stops Zinnia by giving up his and Emerald's Key Stones in exchange for Steven's. Zinnia agrees to Ruby's bribe and retreats.
In ''[[PAORAS10|Omega Alpha Adventure 10]]'' Steven and Mr. Stone stay behind on Sea Mauville while Ruby and the others head elsewhere. Mr. Stone mourns the loss of dimensional shifter, but Steven points out that the cause of Sapphire's disappearance was due to Hoopa, meaning the shifter is still intact, but is in another location. They get a call from the Mossdeep Space Center stating that Sapphire ended up there and gave the shifter to Professor Cozmo and his assistants. Due to news about the meteoroid being leaked to the press, the Space Center is being swarmed by reporters. Steven and Mr. Stone decide to head over there to help Professor Cozmo.
In ''[[PS608|Omega Alpha Adventure 12]]'', Steven and Mr. Stone arrive to help Professor Cozmo with the rocket that the dimensional shifter was attached to. Sapphire tells Steven that she senses Zinnia's presence and goes off to stop her from interfering with the rocket's launch. Sapphire and Zinnia's clash leads the two into battling on top of the rocket while it flies through the air. Eventually Sapphire is defeated, allowing Zinnia to destroy the shifter and knock the rocket into the ocean.
In ''[[PAORAS19|Omega Alpha Adventure 19PS615]]'', Steven and his father travel to Sootopolis City, where Zinnia was taken to after her attempts to get {{DL|Super-ancient Pokémon (Adventures)|Rayquaza}} to join her ended in defeat. Mr. Stone attempts to apologize to Zinnia for the trouble he caused in attempting to control Rayquaza, but Zinnia rejects Mr. Stone's apology and claims that he is only trying to save face for his failures. Now brought to tears, Zinnia gives up and claims there is nothing they can do to stop the planet from being destroyed. This angers Emerald, who claims that they shouldn't give up and there must still be something they can do to save the planet. Together, the group comes up with a plan to gather people from Hoenn, Kanto, and Johto to assist in stopping the meteoroid, now known as [[Grand Meteor Delta]]. As the plan is being set up, Steven gives Zinnia a jar of Key Stones belonging to [[Aster]] that were collected from the Embedded Tower. When Zinnia assumes the Key Stones Steven possessed were taken from the jar, Steven reveals that he actually received his Key Stone from the [[Gurkinn|Mega Evolution guru]] in the Kalos region.
In ''[[PAORAS21|Omega Alpha Adventure 21]]'', the plan to destroy Grand Meteor Delta commences. While Ruby and Sapphire ride Mega Rayquaza and have it attack Grand Meteor Delta with [[Dragon Ascent]], Steven and the three allied regions launch a simultaneous attack. The combined might successfully shatters the meteoroid into pieces. Later, Steven watches with everyone as they watch Rayquaza fly back down with Ruby and Sapphire. After everything had returned to normal, Ruby reveals that [[Diancie]] will travel with Steven to the Kalos region.
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