To Keep the World in Balance

Description: What is it that people and Pokémon ought to do to preserve the world's beauty? What does Zygarde think? What do you believe?

After capturing Xerneas & Yveltal, when you return to the hotel you will find L. He will mention that both are vital to maintaining balance but in excess can destroy it. His memories have started to come back and he tried to give too much then take too much but Zygarde helped him find balance. He then challenges you to a battle.

Pokémon Trainer L	Pyroar	Florges	Sableye	Noivern	Garbodor	Gyarados
Battle Type Items	Level 78	Level 78	Level 78	Level 79	Level 79	Level 80
	Attacks: Hyper Voice Flamethrower Snarl Solar Beam	Attacks: Energy Ball Dazzling Gleam Psychic Calm Mind	Attacks: Will-O-Wisp Night Slash Shadow Claw Confuse Ray	Attacks: Boomburst Hurricane Dragon Pulse Super Fang	Attacks: Gunk Shot Brutal Swing Rock Blast Metal Claw	Attacks: Crunch Waterfall Ice Fang Earthquake
	Hold Item: No Item	Hold Item: No Item	Hold Item: No Item	Hold Item: No Item	Hold Item: No Item	Hold Item: Gyaradosite

Defeat him in battle and he mentions how he'd have never fired the weapon five years ago if he understood the five children that stood against him. Zygarde then beckongs you to the Prism Tower

Description: Go to the tower and you will find Zygarde and challenge it. It is battles akin to Rogue Mega Evolved Pokémon and is done in three phases. The first phase is against 10% Forme where it unleashes some small attacks towards your Pokémon much like a standard battle. Defeat it and it will change to 50% Forme where it's more powerful and unleashes a few moves hitting the field.

Defeat that and Zygarde will change to Complete Forme. Complete Forme tends to target you down more than yuor Pokémon and unleasehs powerful attacks including Land's Wrath, Thousand Arrows and more. It will somethimes charge up a special and unleashe a Core Enforcer on the field, which has two small gaps that are protected from damage, and it will drop a massive Land's Wrath that cannot be avoided. Defeat it and Lysandre will suggest throwing the Poké Ball to catch it

Zygarde Level 84

OT: Yours ID: Yours Hold Item: None

Quiet Nature. Date of Receiving Wild Zone 20. Met at Lv. 84

Core Enforcer Thousand Arrows Thousand Waves Land's Wrath

Defeat Zygarde and L will mention that you combining your power with Zygarde gives him hope for the future of the city and thanks you. He hopes that he can make the dream of people fluorishing, but it could take three thoussand years so will travel vast to search for ways to make the world the best it can be, and says goodbye.