"I know…we can't undo everything that's happened," Shaymin said. "But if we can help you set things right…maybe we can begin to atone for what we did."
Luke felt the anger of his friends, mainly his sister Luna. They blamed Shaymin and the others for working with Zygarde. He had to say something.
I don't blame you! Luke cried out. All of you…you were just as much victims in this as everyone else! He felt the shock of his comrades, but continued: We'd welcome your help! We need to stop Zygarde once and for all!
"You're right!" Shaymin cried out. "But look! The chasm ripped by the Land's Wrath cuts through the prison camp, side to side, and the fence doesn't have other gates. I'm still in my Sky Forme, and some of the other Pokémon over here can fly, so we can carry Pokémon across the chasm, then we can go up the mountain!"
"There's…no time!" Pikachu cried out. His voice was still clearly grieved. "Something's...wrong. Zygarde's attack shouldn't have been NEARLY that powerful...Dad shouldn't have..." Tears beaded down his face.
"The distortions I created," Giratina roared remorsefully. "Zygarde had me form a hidden pattern with them. One no one would be able to detect. There's one in Surveillance Mountain, and because of the pattern of distortions, that one is more powerful, by and far, than the others. At this point, I wouldn't put it past him to be harnessing the power of the distortion...a power to distort reality as we know it..."
"I can feel it," Pikachu said. "He's using the distortion to make himself more powerful, which...could have disastrous consequences...we've rounded up almost all of the unnaturals...it's almost time. He's going to set a 'final plan' in motion, he's saying. I don't know what it is, but...it's why he left after attacking. I do know this much: if we wait until everyone's across, we won't have time to get up the mountain!"
Then we have to go ourselves, Luke said to his comrades.
"What?!" Pikachu cried out, as did Luna, Kira, Kuro, and Shaymin.
"Luke," Pikachu said. "Zygarde holds the power of the distortion inside the mountain. There's no telling what will happen if we fight him now!"
I don't care, Luke said. At the very least, if...he finishes us off...maybe we can buy some time until everyone gets up the mountain to fight him. Tears streamed down his face. Dad sacrificed himself for us, and I'm not letting it be in vain! One of his last wishes was for us to protect this world, and I'm going to give it everything I have! Luna…Kira…Kuro…Pikachu…what do you all say?
There was a pause, still full of grief, but also of pondering.
"I'm going to do what Dad wanted," Luna said. "I'm sticking with you, Luke."
"I'm coming, too," Kira said. "Just like Luke, I'm giving it my everything!"
"Me too!" Kuro added. "Wherever my friends go, I will follow! What my friends give, so will I!"
"Count me in!" Pikachu cried. "Luke…you really are something special, you know that?"
Luke was able to flash a sad smile as the group headed around the base of the mountain, all the while hearing cries of support from Shaymin, then the agents of SIRS, before they faded from earshot.
"Keep going, and you'll find the cavern leading into the mountain!" Shaymin cried out.
"Good luck!" Heracross cried.
"Be strong in there, you hear?!" Thundurus roared, with agreement from Tornadus.
"I'll think about how you'll win in there!" Psyduck called.
"You can do this!" cried Hippopotas.
"MY ANALYSIS INDICATES YOUR IMMINENT SUCCESS IN YOUR MISSION!" Porygon2 cried out.
"Please be safe!" Togetic cried.
"Let's go, and win!" Munchlax called out.
That was the last they could hear.
Soon, they reached a cavernous entrance.
"This cave is an intense Mystery Dungeon," Pikachu said. "I'm sure the distortion in here is riling up the Pokémon that live in there and is bringing in Pokémon that wouldn't be expected in a place like this."
But we can do this, Luke said. For Dad. For our friends. Let's go.
It was the toughest Mystery Dungeon yet, but the intrepid group of children would not be stopped. They were finally about to corner Zygarde; the final battle was upon them, and they only had one shot to stop Zygarde from completing his plans. The Mystery Dungeon threw everything it had at them, but the children wouldn't be deterred.
Finally, they reached a way to a clearing.
Pikachu paused and said, "Zygarde is in there. The 50% Forme that monitors everything. You could call it the command center of Zygarde. He will have no intention of fighting fairly; he wants to get rid of us."
The group shuddered, but Luke said, I'm ready. Let's do this.
They entered the clearing, and stared into the eyes of Zygarde.
There was nothing; no savage joy, no remorse…no emotion, nothing. His stare was analytical, as if studying his prey. He had no love, no care, no regard for life. Words could not describe the horror that was this cruel being, who lied and manipulated everyone to push them to their doom, conquer two different worlds, and create savage dystopias out of them. How Zygarde had gone from a benign guardian of the land…to THIS, Luke couldn't comprehend. Nothing, no disaster or tragedy in the ecosystem could come close to justifying what Zygarde had become.
Suddenly, Zygarde glowed green, and his cells began flashing white all over his body. A bright flash in his eyes accompanied a vicious attack, Land's Wrath.
"Look out!" Luna cried, and everyone dived out of the way; they were farther away and had more advanced warning, so they dodged unscathed.
Zygarde swung his massive body, trying to use his tail to knock the children away, but the children dodged and leapt in front of the furious Zygarde.
"You filthy unnaturals don't deserve our words," Zygarde said. "But know this; it is because we are charging ourselves with our new power that you don't die instantly, like the unnatural outside."
"HOW DARE YOU?!" Luna cried, preparing to lunge at Zygarde; she stopped when Luke held up his arm.
Don't make this about revenge, Luke said. That's not what Dad would want.
"Instead, your deaths shall be slow and painful," Zygarde said. "Resist all you want; perhaps it might amuse us."
"No!" Pikachu cried. "Our resistance won't be for your amusement! It will be your defeat!"
"You've done nothing but intentionally bring pain to everyone you've used and hunted down!" Kira cried.
"Kira's right!" Kuro cried. "We won't let you cause any more pain!"
"For our friends…for Dad…" Luna said.
We will stop you here and now! Luke finished.
"So be it," Zygarde said. "As we said, resist. It will be futile. Then, you'll taste our enormous power, but you won't live to tell anyone about it! Finally, the worlds will be ours!"
Zygarde roared and glowed, and he and the children warped into the Honey Haven.
As the children took in the surroundings, the Pokémon of the Honey Haven, agitated, surrounded the children.
"So that's Zygarde's plan," Kuro said. "To use the powers he's gaining from the distortion to warp us between Mystery Dungeons, agitating Pokémon to give us more opponents to fight while he weakens us."
Well, it won't work! Luke cried. Let's fight!
The battle was on. Luna, Kira, and Kuro took on the Honey Haven's Pokémon as Luke and Pikachu fought the vicious Zygarde. Once the Pokémon were knocked out and Zygarde took damage, a change to the Sacred Electric Lands accompanied Zygarde's roar.
Pikachu and Kuro switched attack positions, and soon, the Pokémon were knocked out and Zygarde was damaged.
With a roar, Zygarde sent them to the Challenger's Dungeon. He was damaged by Kira and Kuro as Luke and Kira switched places.
Next, they warped to the Discovery Meadow, then the Sacred Lands of Wind, then the Sacred Lands of Abundance, then the Distortion Marsh, then into the Billowing Caverns. The same strategy held; Pokémon attacked, and the children took turns fighting the local Pokémon and Zygarde until the former were knocked out and the latter warped them somewhere else.
They all noticed the prison camp was empty when they warped there, so the five children, despite their injuries from the fight, all fought Zygarde. They attacked with all of their might, resisting Zygarde's attacks and putting all they had into their own.
Finally, the children and Zygarde began warping erratically from dungeon to dungeon as Zygarde roared and flailed, leaving no time to fight, until they settled back in the cavern at the peak of Surveillance Mountain.
At that, Zygarde collapsed.
We…we actually did it…Luke said, panting.
Zygarde groaned in pain as several Cells dissolved from his body, reducing him to his 10% Forme. He climbed up, defeated and exhausted, but still hateful and unwilling to surrender.
The children surrounded Zygarde, preparing one final attack to finish him off; it was at that when SIRS, Shaymin's gang, and all the legendary Pokémon arrived to provide assistance.
"What's happening?" Shaymin asked.
"Zygarde's...down," Pikachu said. "We can defeat him right here, right now."
With a furious roar, Zygarde bellowed, "NOOOOOOOOOOOOOO!" At that roar, Zygarde morphed into a clump of Cells and flew through the air towards the united group.
"Zygarde's Thousand Arrows!" Pikachu cried.
"Look out!" Kira cried, barreling in front of everyone and using Protect. Unfortunately, it was only able to cover herself and the other children.
As for everyone else, those who could fly were slammed into the ground.
The clump of Cells that was Zygarde swept along the ground, an attack which Pikachu identified as Thousand Waves. The Cells seemed to churn up the ground as they came, but no one could react quickly enough except the children.
Kira was able to Protect her immediate allies, but everyone else was trapped by the churned-up ground. They couldn't move or leave.
Zygarde's Cells returned into his 10% Forme as more and more Cells and Cores began to swarm out of the ground and puddle around him. He seemed out of energy, but he had something else up his sleeve.
That was when Zygarde began to glow and the cavern started to shake.
"What's happening?" Luna said.
A hole broke in the cavern's roof, revealing sunlight and a barrage of green beams, which fell onto Zygarde. The puddle of Cells simultaneously began barreling up around Zygarde as he began to laugh.
"Oh no," Pikachu said. "He's using the distortion to restore the energy he lost; in reality, what he lost was nothing compared to the power he had stored away inside himself; I knew it seemed too easy to beat him. He was purposefully holding back; he was just stalling for the sake of his power."
All of a sudden, Pikachu shook, screamed, and collapsed as green beams emerged from his body towards Zygarde.
The other children, being the only ones able to move after Zygarde's attack, raced to Pikachu's aid and helped him weakly get to his feet.
"Zygarde…" Pikachu said. "He…pulled the Cells and Core from my body. But…" He heaved and supported himself. "I can hang on. I'll be OK, I think…"
When Pikachu had fully regained his balance, everyone looked at Zygarde.
He was even more enormous than before; he stood on two legs and seemed to emanate power from his entire body. His torso had eyes and a mouth, and glaring from Zygarde's face were eyes even more menacing and hateful than before, if that was possible.
"Zygarde...he's assumed his Complete Forme," Pikachu said, beginning to panic. "He's united all of his Cells and Cores into one being. He normally does this on instinct when his 10% or 50% Forme is weakened. But this is something different entirely...Zygarde...his plan...they're...both...complete. And even that's not enough!" He was hyperventilating at this point and almost collapsed; Luke caught him, and after a moment, Pikachu calmed down and continued, "He's sapping power from everyone that's stuck in the ground! It started the moment his Cells attacked them. It's...it's hopeless...we're powerless next to him."
"Brilliant observation," Zygarde sarcastically mocked. "Now...it's time to eliminate the unnatural!"
Zygarde soared high up and used what Pikachu identified as Core Enforcer, firing a beam and etching a "Z" into the ground as it smacked everyone trapped in the ground, but not the children, whom Kira was able to Protect again.
Zygarde laughed as everyone hit by Core Enforcer collapsed, on the point of death; he had sapped nearly all of everyone's power at once. By firing this beam, he had dealt heavy damage to them and, through the beam, drawn their power into his Cells.
Zygarde slammed into the ground with a thud, cracking a chunk of the rocky cave floor around his feet; the children ran back to avoid the effect of the impact. The chunk of rocky cave around Zygarde's feet cracked away from the ground and started slowly moving upward as Zygarde cruelly laughed.
"You will all be destroyed, bound to this cavern!" Zygarde roared. "We will propel this rock up into the far reaches of space and then barrel it back down to obliterate this mountain and anything in and around it! The impact, combined with the powers of our distortions, will create a gap between the Pokémon and human worlds, where, with our new powers, we will assume full control of these worlds!"
"No!" Pikachu said. "He's going to drop that rock on us, and everyone else can't get away!"
"We ran back too far!" Kira said. "We'll never make it over there onto the rock in time!"
"Unless…" Kuro said, looking and nodding at Luna and Kira. Then, looking at Luke and Pikachu, who had instinctively leapt in front of them, he shouted, "Luke! Pikachu! Run towards Zygarde!"
They did so, as they heard Luna, Kira, and Kuro running behind them.
"JUMP!" Kuro cried as they got close to the rock.
Luke and Pikachu leapt; they'd never reach it, or so they thought; nevertheless, they did so.
As they fell, Luke felt Luna under his foot, boosting him up; she leapt with all of her might, and Luke jumped, getting closer to the rock.
Luke saw Pikachu jump from on top of Kuro, who slashed him higher.
A final burst of Kira's Psychic power sent Luke and Pikachu higher; they were able to grab and cling onto the edge of the rock.
"LUKE! PIKACHU! YOU CAN DO THIS!" Luna cried out. "IT'S UP TO YOU NOW!"