A girl who also gives Alan a tough battle. Her partner Absol can mega evolve into Mega Absol.

The journey of Satoshi and his friends through the Kalos region continues! After Satoshi obtains his seventh gym badge, the group is moving toward the next town when Eureka discovers a mysterious Pokémon resting in her pochette. Soon given the name Puni-chan, it is one that even Satoshi and Serena's new Pokémon Zukan cannot identify. However, it quickly becomes apparent that Puni-chan is the target of a mysterious group clad in bright red suits known as Team Flare, aiming to capture the new Pokémon to further their agenda. But when Satoshi and the gang realize that the enigmatic organization has no intention of treating Puni-chan with any decency, they take a stand in opposition to Team Flare's plans, daring to fight back.
 
With Gojika's predictions looming above them, Satoshi aims for his final gym badge while Serena contests for her last Princess Key in order to be able to compete at the TriPokalon Master Class. But as Team Flare begins to move in search of the mysterious Z, the stories of Pokemon XY and Pokemon XY: Mega Evolution cross paths as Satoshi and his friends, along with Team Rocket, get caught up in a scheme that could put Kalos in great danger.
 
(Source: MAL Rewrite)

The story is set in Diamond Ore Country, of which Diancie is the princess.This is a country located deep underground, where the Pokémon Carbink live together in peace. The energy source of this country is a giant diamond called the Sacred Diamond, which can only be created by princess Diancie. However, the current princess doesn't yet possess the power to create such a diamond, and the current Sacred Diamond's power is soon going to run out, which would result in the end of the country. Diancie meets up with Ash and Pikachu, and set off together with them to search for the legendary Pokemon Xerneas, which possesses sacred power, but on the way, they find the cocoon where the Destruction Pokémon, Yveltal, who was said to have once destroyed life in Kalos, lies in wait.
 
(Source: serebii.net)

Mega Evolution. A new evolutionary form introduced in the Kalos Region. Is it really possible for all Pokémon to undergo Mega Evolution? This story revolves around a young trainer named Alan and his partner Lizadon (Charizard). Alan's objective on his journey is to "defeat all Mega Evolution Pokémon and stand at the top of the strongest summit." Along their journey Alan and Charizard meet and battle with Mega Absol and Mega Gaburias (Mega Garchomp). Additionally, Alan will battle with Zumi (Siebold), one of the Kalos Elite Four. Does Siebold also have a Mega Evolution Pokémon? Why is Alan so obsessed with Mega Evolution? And what is the real purpose of his journey?
 
(Source: Anime News Network)

Ayaka