Metagross first appeared in Mega Evolution Special II as a Shiny Pokémon capable of Mega Evolution. Steven sent it out in a battle against Alain's Charizard. It had very little trouble handling Charizard both offensively and defensively. Before the battle could be finished, however, it was interrupted by Lysandre and his Pyroar, who used Flamethrower. Steven later sent out Metagross and Mega Evolved it while facing Mega Rayquaza. When Alain's Charizard was struck by Rayquaza's Dragon Ascent, Metagross tried to grab it, but was knocked away by Rayquaza. It was then forced to take evasive action to avoid Rayquaza's Draco Meteor.
Metagross reappeared in Mega Evolution Special III, where it was used to battle PrimalKyogre and Primal Groudon to prevent them from reaching the Megalith. While Charizard faced Groudon, Metagross took on Kyogre. After Charizard was overpowered by Groudon and then returned to its Poké Ball, Metagross dealt with Kyogre by itself. It later protectedMairin from incoming chunks of ice while she was getting Alain to safety after he was knocked unconscious. Both Kyogre and Groudon were eventually stopped and defeated by Mega Rayquaza.
In the following episode, Metagross was sent out to fight against the Megalith Zygarde to prevent it from reaching Anistar City's Sundial alongside Serena's Braixen and Professor Sycamore's Garchomp. The three Pokémon were quickly subdued by the creatures massive roots, but were freed by Ash's Pikachu and Greninja, and Alain's Charizard. Despite their help, Metagross and the others were eventually subdued again, but were freed once again by a combined attack from from the Pokémon of all the KalosGym Leaders and Diantha. After strategizing, everyone combined their powers to fend off the Giant Rock's roots, allowing Ash and Alain to reach its center and save Chespie, bringing the creature down. After the resurrection of the Megalith Zygarde, who was now controlled by Lysandre, Metagross continued to fight the creature until Lysandre's control device was destroyed which allowed Squishy and Z2 to destroy the Megalith Zygarde.
During its battle with Alain's Charizard, Metagross was shown to not only withstand powerful attacks, including ones that are super-effective, such as Blast Burn, but deal large amounts of damage as well with powerful Steel-type attacks, such as Flash Cannon and Meteor Mash. As shown in Mega Evolution Special III it can be friendly, such as protecting Mairin with Protect voluntarily and fistbumping Chespie after the battle.
Metagross was distributed at Japan's Pokémon Game Show from August 17 to 18, 2013 as one of the Champion's Pokémon that appeared throughout all main series games released prior to Generation VI. Their level and moveset are based on the main series games they first appeared in. It has IVs of 30 for all stats.
The Trainer ID number is based on the game's release date in Japan, November 21, 2002.
After Groudon and Kyogre are defeated and return to their slumber, Steven dies from the strain of controlling three Legendary Pokémon at once. Wallace borrowed Metagross to transport himself to Sootopolis so that he can help combat Archie and Maxie for the final battle. Metagross was returned to its Trainer after Steven was revived with Ruby's Celebi's powers.
In Omega Alpha Adventure 6, it is revealed that with Steven's Mega Stickpin and its Metagrossite, Metagross can Mega Evolve into Mega Metagross. It first Mega Evolved to battle a mysterious Pokémon that attacked Emerald on the Sea Mauville. It Mega Evolved again to battle Zinnia and her army of former Team Magma and Aqua Grunts. As the battle goes on, Metagross quickly exhausts itself and loses the energy to battle. Steven reveals that Metagross also donated its life energy to the dimensional shifter, but the energy drain left it much weaker than normal and it cannot stay Mega Evolved for a long period of time. Steven states he attempted to try various means to bring Metagross back to full strength, but none of them worked.
In Leaping Past Lopunny, Metagross was seen with Steven as he sold the Villa he was staying in while searching for rare stones in the Sinnoh region. Once he finished, the two flew back to Hoenn.
Personality and characteristics
Metagross's magnetism allows it to float in the air, and as such, Steven has been mainly relied on it as a method of flight transportation. It has also shown to be an extremely strong battler, defeating a group of wild Pokémon at once without any sort of trouble.
During the Groudon and Kyogre arc, Metagross allowed Wallace to ride on it after Steven was killed by the strain of controlling the Legendary golems.