Jethro/Meteor Threat

The Hoenn Pokédex holders are enlisted by Steven and Mr. Stone to prevent a meteoroid from crashing into the Earth and destroying it. Steven gave the three a Mega Bracelet enabling them to use Mega Evolution and had them train with Ultima so Swampert, Blaziken and Sceptile could fully master the Ultimate Moves. Jethro only agreed to help on the condition that Gwendolyn be kept in the dark about the meteoroid. While Gwendolyn and Magna practiced with each other, Jethro had plans elsewhere and lent Swampert to Gwendolyn so it could train without him.

Jethro arrives at Southern Island, where by using the Eon Flute, he meets up with Latios and Latias. After telling them about the crisis, Jethro and Latios traveled to the Sky Pillar by soaring through the sky while Latias stays behind. After encountering and defeating the Draconid, Zinnia, Jethro learns that she sent the Salamence that attacked the Pokémon Associaton facility years ago. Before leaving, Zinnia told that she planned on stopping the meteoroid alone, without the Devon Corporation's help.

Jethro and Latios were approached by the Draconids Jinga, Renza, and Tomatoma, who revealed Zinnia wanted to stop the meteoroid in place of Aster, a deceased Draconid and the former Lorekeeper. The Draconids asked Jethro if Zinnia had a scroll on her, but the conversation was forced to an end when pieces of the meteoroid began falling down. Jethro and Latios were hit by one of the pieces, knocking them into the sea. Jethro and Latios later awakened in a cave, where they were taken to after being rescued by Diancie, a Mythical Pokémon. Fully realizing the weight of the danger the meteoroid possessed, Jethro broke down in tears and voiced his desire to protect the planet so that he can enjoy the things he does with the people he loves. Using its Sight Sharing, Latios and Jethro witnessed Steven and Mr. Stone draining Blaziken and Sceptile's life energy to power the dimension shifter, a machine that could stop the meteoroid. Questioning Steven and Mr. Stone's methods, Jethro decided that neither Zinnia or Devon would stop the meteoroid. Instead, he decided that he would ride on Rayquaza and stop it himself.

Jethro arrives on the Sea Mauville, where he fought to stop Zinnia from destroying the dimenional shifter. When Gwendolyn was nowhere to be found, Magna revealed that Hoopa used its rings to warp her to a different location. Zinnia continued attacking in order to take Steven's Key Stone, but stopped when Jethro offered up his and Magna's Mega Bracelets as a bribe. Zinnia accepted and left, completely unaware that Jethro managed to steal the scroll when she wasn't looking. The group then traveled to Meteor Falls in hopes of finding information about Rayquaza. Hoopa was attacked by Blaise and Amber and manipulated into summoning Groudon and Kyogre with its rings. Using an illusion, Blaise and Amber bought themselves enough time to escape and allow Groudon and Kyogre to revert to their Primal forms. To Jethro and Magna's shock, Maxie and Archie had returned and were the ones who gave Groudon and Kyogre the Orbs necessary for Primal Reversion. Using the super-ancient Pokémon's power, Maxie and Archie easily knocked Jethro and Magna out of the sky before revealing that they also intended on stopping the meteoroid.

Jethro and Magna awakened at the Meteor Village, the home of the Draconids. The village Elder revealed that Gwendolyn fought to protect the dimensional shifter, but lost and went missing. The Elder also allowed Maxie and Archie to train and teach Groudon and Kyogre moves necessary for stopping the meteoroid. After meeting with his father again, Jethro and Norman determined that Rayquaza must be heading towards the Pokémon Association's research facility in Goldenrod City and used Hoopa's ring to head there as well. Jethro and Norman entered the now-abandoned research facility. After purifying Magna's Green Orb core into a shade of jade, increasing its abilities, they found Rayquaza outside, feeding on fallen pieces of the meteoroid. Jethro and Norman managed to control Rayquaza with the Jade Orb and teach it Dragon Ascent with Zinnia's scroll. Hoopa opened a path back to the village, only for Rayquaza to go berserk after seeing Groudon and Kyogre, causing Norman to be left behind. Panicking, Hoopa moved the ring to the direction of another one, accidentally sending Jethro and Rayquaza to Route 120. After Rayquaza angrily throws Jethro away, the boy is rescued by Lenny, who battled Rayquaza in order to subdue it again. Jethro stopped Lenny and convinced Rayquaza to join him by offering to destroy the meteoroid together.

Soon afterwards, Jethro encountered Gwendolyn again and apologized for lying to her. Agreeing to help stop the meteoroid, Gwendolyn joined Jethro and jumped onto Rayquaza's head. When a larger piece of the meteoroid appeared, Jethro and Gwendolyn teamed up with Maxie and Archie, combining the power of Hoenn's three super-ancient Pokémon into one attack to destroy it. After they succeeded, Gwendolyn used the Jade Orb core to peer into Rayquaza's mind, revealing it needed the power of Mega Evolution to defeat the actual meteoroid.

Zinnia managed to lure Rayquaza away from Jethro and Gwendolyn, but her attempt to convince the Sky High Pokémon to join ended with it rejecting and attacking her. Zinnia was rescued by Latios and taken to Sootopolis City to recover from her injuries. Brought to tears, Zinnia gave up and admitted there was no way to save the planet anymore. Magna disagreed and suggested the three factions that tried to stop the meteoroid work together instead of fighting with each other. The group's allies from around Hoenn gathered together to lend a hand and stop the meteoroid, now known as **Grand Meteor Delta**. After changing into their Magma and Aqua Suits, Jethro and Gwendolyn set off with Rayquaza to space. With the power of Mega Rayquaza and the combined might of their allies from Hoenn, Kanto and Johto, Jethro and Gwendolyn successfully shattered Grand Meteor Delta into pieces. A Deoxys emerged from the wreckage of the meteoroid, but was defeated when Rayquaza shattered its core, knocking it unconscious. Afterwards, Rayquaza took Jethro and Gwendolyn back down to Earth, where they reunited with their friends.