If held by a Lucario, allows it to Mega Evolve into Mega Lucario if its Trainer has a Key Stone. Each Trainer can only Mega Evolve one Pokémon per battle.
Unaffected by item negating effects (such as Embargo and Klutz). Item manipulating effects (such as Trick and Fling) cannot give Lucario a Lucarionite or remove a Lucarionite from Lucario.
Outside of battle
If held by a Lucario, allows it to Mega Evolve into Mega Lucario when it performs a Spectacular Talent during a Pokémon Contest Spectacular while its Trainer has a Key Stone. Lucario will remain a Mega Lucario until the Talent Round ends.
The player can obtain the Lucarionite by completing Mission Card 2.
The Lucarionite was also available as a prize during the Mega Lucario competitive stage. This competitive stage ran on the Nintendo 3DS version from March 15 to 22, 2015; May 18 to 25, 2015; July 13 to 20, 2015; and January 30 to February 6, 2018. It ran on the Pokémon Shuffle Mobile from December 1 to 8, 2015; and January 30 to February 6, 2018. It was also available via passcode on Pokémon Shuffle Mobile from August 25 to September 30, 2015.
The Lucarionite enables the following Mega Evolutions:
A Lucarionite made its physical debut in The Cave of Trials!, where it was found by Korrina in a cave near Geosenge Town. After battling a Blaziken guarding the Lucarionite—which was later revealed to belong to Korrina's grandfather Gurkinn—Korrina obtained the Mega Stone and used it to Mega Evolve her Lucario. The uncut Lucarionite was later set in an armband by McGinty, allowing Lucario to wear the Mega Stone. It retained it during its return in Pokémon Journeys: The Series.
In The Aura Storm!, Gurkinn was revealed to own another Lucarionite. Much like Korrina's Lucario, Gurkinn's Lucario also wears its Lucarionite in an armband on its left wrist.
In Origins of Mega Evolution!, Gurkinn told a story about the first known Mega Evolution, which featured a Lucarionite.
Korrina possesses a Lucarionite, which first appeared in The Aegislash Agenda. It was later revealed that she and her Riolu had found the Mega Stone together in the past, as a task set by Gurkinn in order for her to become a Mega Evolution Successor.
