The One That Gives

Description: Work together with Mable, who was once a member of Team Flare, to protect Lumiose City from the threat of "the one that gives."

After the first round of the Infinite Royale, you get a call to return to the Hotel. When there, L will appear and will mention how more of his memory has returned and explains about the two Legendary Pokémon that they did experiments with. He mentions that there are reports of some strange readings from the Wild Zones which he believes it's the two Legendary Pokémon.

Description: Go to talk to Mable and she will mention that some anomalous Alpha Pokémon have been reported in Wild Zone 3, Wild Zone 5 and Wild Zone 9. Go to those Zones and calm the Steelix in Wild Zone 3, Gallade in Wild Zone 5 and Pangoro in Wild Zone 9.

After doing that, Mable will mention how she has reports of Xerneas being in Wild Zone 11 and is concerned that Xerneas' energy will set off the tower so says for you to catch it.

Description: When you get to Wild Zone 11, you will find Xerneas amongst the grass and can challenge it.

Xerneas Level 75

OT: Yours ID: Yours Hold Item: None

Random Nature. Date of Receiving Wild Zone 11. Met at Lv. 75

Megahorn Moonblast Horn Leech Geomancy

After defeating it, Mable appears and congratulates you and thanks you for your help