Gallantmon, Sakuyamon, MegaGargomon, Beelzemon, Justimon, Kuzuhamon, Ash and the Super Pokemon Pikachu stood in front of Ultra Mewtwo, who glared at the group of heroes and heroines.
Unleashing his power, Ultra Mewtwo then fired rapid spheres of Shadow Balls at his enemies, who leapt out of the way, while Sakuyamon and Kuzuhamon prepared to strike back
"Amethyst Mandala!" Sakuyamon announced as she plunged her spear into the ground, creating a circle of energy around herself, before unleashing a blast of energy directly at Ultra Mewtwo.
"Amethyst Storm!" Kuzuhamon added, mimicking the actions of her sister, only she created a dark purple energy ring, which was followed up by a blast of black magic, to which both attacks combined and struck Ultra Mewtwo, who was then knocked back a little, before the Psychic-type saw Pikachu appear in front of him, and was unable to counter as Pikachu slammed both feet into his stomach, sending the DNA Pokémon flying back.
"Wow. Pikachu's so strong now." MegaGargomon commented.
Managing to pull himself up, Ultra Mewtwo held his stomach and glared at Pikachu.
'How can someone so small have so much power?' He asked himself, but had to put his questioning aside, for he could sense another powerful force coming at him.
"Lightning Joust!" Gallantmon suddenly announced as he fired a tremendous blast of lightning from his lance, which Ultra Mewtwo managed to avoid, but the power of the attack devastated the area around him and caused some of it to ricochet from the ground and hit him, causing Ultra Mewtwo to groan out loudly from the pain inflicted upon his body.
Meanwhile, as the Digimon and Pokémon continued, fighting as a team to stop Ultra Mewtwo, Serena and Lucario each let out a small moan, before both opened their eyes as they regained consciousness, finding that Braixen, Jeri and the others succeeded in healing them.
"Serena, are you alright, Serena?" Asked Braixen.
"I am fine. But what about Ash and...?" Serena began to ask, before Jeri pointed behind the blonde.
"Just look at Pikachu and see for yourself." She said.
Doing as Jeri had said, Serena and Lucario turned, to which both were shocked to see a gold furred Pikachu, with a yellow aura surrounding him and was floating in mid air.
"T... that's Pikachu?" Lucario questioned in surprise, wondering how Pikachu had gained so much power.
She was also concerned, for she could sense his Aura had changed to one filled with anger and rage, but could sense even with such a power created by negative emotions, Pikachu was not only controlling it, but purifying it.
"How dare you! Take this! Death Psybeam!" Mewtwo yelled as he fired another Psybeam, only for it to bounce off of Pikachu's aura, shocking Ultra Mewtwo.
"What's the matter, Mewtwo? Pikachu cannot be harder to destroy then a Rayquaza right?" Ash called out, which actually filled Ultra Mewtwo with fear from what he had heard and made him question. "W... who... What are you!?"
"You haven't figured it out yet? I am a proud Pokémon, trained by a human I am proud to call my best friend, and I am here to defeat you and free your good side! The anger you caused me, has awakened the Legendary warrior that lived in my heart. Pure of heart, awakened by fury, that is what I am. I am the Super Pokémon, Pikachu!" Pikachu announced
"Well spoken, Pikachu!" Charizard called out.
"Besides, you're only using the Mewtwo I know for your evil purposes!" Ash called out to the good Mewtwo within Ultra Mewtwo's being.
"Be silent, human!" Ultra Mewtwo snarled, before he fired a Shadow Ball at Ash, only for Pikachu to move in front of him and deflect it with his tail.
"Don't you dare try to harm Ash!" Pikachu called out as he then darted in front of Ultra Mewtwo and slammed his tail into his face, followed by a plummet on punches on his stomach and chest, causing Ultra Mewtwo to yell in pain, before Pikachu finished his onslaught as he electrocuted Ultra Mewtwo with a powerful Thunderbolt attack that sent the Psychic-type into the sky.
"That's amazing. But leave some fighting for us too." MegaGargomon then said, before he called out in a strong tone. "Mega Barrage!"
"Fist of the Lion King!"
"Fox Drive!"
"Shield of the Just!"
"Pikachu, use Electro Ball!" Ash called out, causing Pikachu to follow Ash's command as he then summoned a giant electricity ball on his tail, before firing it, along with the other attacks, which all collided with Ultra Mewtwo, making a huge explosion erupt in the area.
"Yes, that did it!" Sylveon cheered.
"No, hold on. Look" Sceptile then said, snarling as he saw Ultra Mewtwo had survived the attacks and was floating in the air, while a look of fury appeared on his face.
"How dare you harm me! So be it, I will destroy this entire pathetic world!" Ultra Mewtwo exclaimed, shocking everyone at what he had stated and made Kuzuhamon ask. "What did he say?"
Ultra Mewtwo, showing he wasn't bluffing and had lost what sanity, then had his left hand up, creating a massive ball of energy that radiated with such power, just by looking at it, anyone could tell it had the power to destroy a planet.
"Stop it! You'll destroy us all!" Sakuyamon called out.
"Do I care on what happened to your humans or these so called warriors you called Digimon? After you are gone, I will destroy both mine and the human worlds and no one can stop me!" Ultra Mewtwo exclaimed.
However, remembering this was the evil side of Mewtwo in command, Ash then called out, in one final attempt to save everyone.
"Good Mewtwo, can you hear me in there? If you're in there, fight back against your evil self! You're way stronger than he is! You're created this madness, you can destroy him!" Ash called out.
-Inside Ultra Mewtwo's being-
The good Mewtwo was watching all the events in his mind, strapped by chains made of dark energy and was pained on what he was doing.
"I have done many evil deeds that I put an unknown world in danger. I can never be forgiven. My evil self is more powerful than I am." He said in sorrow, lowering his head in defeat.
But then he heard Ash's voice calling out to him.
"You're created this madness, you can destroy him!"
Mewtwo's head shot up and his eyes opened with realisation.
"That's right! My evil self only been born because of my distrust of humans. Now I know I can trust them, I can destroy him!" He said, finding his inner strength, which he used to struggle against the chains binding him.
And then, with one mighty pull, he pulled himself free.
"Now to take back my mind and body!" Mewtwo then said, before he teleported away.
-Back in the Digital World-
"You meddling human! You shut up or do you want to perish at my hands first?" Ultra Mewtwo called out and was about to unleash a fraction of the force he now had at his disposal, but stopped when something struck his mind, to which Ultra Mewtwo then yelled in pain as the attack disappeared.
Noticing something was wrong with him, Greninja questioned. "What's going on with Ultra Mewtwo?"
But before Greninja could get an answer, the entire area became purple, to which everyone, even Ultra Mewtwo was consumed and found themselves now inside Mewtwo's consciousness.
Curious and confused, Gallantmon asked. "Now where are we?"
"N... No... Don't tell me... you..." Ultra Mewtwo struggled to say, while clutching his head, before everyone saw behind Ultra Mewtwo was the good Mewtwo, who was restraining the evil one.
"How did you get free?" The evil Mewtwo questioned as he struggled to get free. "Let me go! I said let me go!"
"Kids... listen to me." The good Mewtwo told everyone below.
"I am restraining my evil self from destroying your world! End it now before it's too late!" He called to them.
Hearing that was a shock to all, knowing what Mewtwo wanted.
"But Mewtwo, what about you?" Ash called out.
"If I have to die to save both our worlds, so be it!" Good Mewtwo replied, continuing to hold back his evil side.
"No! If you do that, you kill us both!" Evil Mewtwo called out, his tone full of fear.
"I'd rather die than be controlled by someone like you. Just do it! Hurry!" Good Mewtwo called out in a desperate plea.
"I don't have a grudge against you, Mewtwo, just your evil self, but if it means for us to defeat your evil self, it has to be done." Pikachu said.
"Thank you little one. Hurry and destroy us, hurry!" Good Mewtwo called out.
"We're sorry, Mewtwo." Ash said, lowering his head as a tear trailed down his cheek, before his head shot up and he yelled. "Pikachu, use Volt Tackle Fist!"
Pikachu then flew up in the air, towards Ultra Mewtwo in a blast of electricity as he powered up his fist.
Watching him and placing her faith in him, Lucario called out. "Pikachu, you can do it!"
"Take him down!" Charizard added.
"Let's do this, Pikachu!" Ash then called as he held up his fist, making Pikachu do the same, which then went straight through Ultra Mewtwo's body, causing the two Mewtwos behind him to then collapse to the ground, each now had a hole through their chests.
"Damn... defeated again..." Evil Mewtwo managed to say, before he then burst into countless particles of Data and was deleted, causing Good Mewtwo to smile, knowing it was all over, before the Pokémon, Pokémon Trainers, Digimon and Digimon Tamers all found themselves back in the Digital World and watched as Ultra Mewtwo's body broke apart, releasing all the Digi-Cores he had absorbed, which returned to the respective bodies of the Digimon he absorbed.
And with Ultra Mewtwo gone, so too was Pikachu's Super form, for he had used all his strength in that last attack and returned to normal, but then began to fall towards the ground.
"Pikachu!" Ash called out, wanting to save him, but stopped as Lucario darted past him and grabbed Pikachu before he hit the ground.
Meanwhile, Ultra Mewtwo may have been destroyed, but the form of Mewtwo remained, which had hit the floor with a massive crash, while all the Digimon reverted back to their original forms.
"It's over." Guilmon sighed in relief, making Takato sigh too, before he smiled, glad to know his friends and allies had saved their worlds once again.
However, with their victory came a great loss, to which Ash and Serena knelt down by Mewtwo's side and saw the huge hole Pikachu had left through his chest.
But ignoring the pain, Mewtwo slowly opened his eyes and smiled.
"Once again, you come to my aid to realising the truth. The evil in me is gone, but so am I." He got out.
"Mewtwo... why... why did you let him control you in the first place?" Serena asked in concern.
"Darkness can twist you around most of the time. But now I know that humans and Pokémon can live in harmony. I am sorry for putting the Digital World into so much peril." Mewtwo said weakly.
"Mewtwo..." Ash could only say, which just made Mewtwo smile and put a hand to Ash's face.
"Thank you again, Ash... take care of all Pokémon... And tell Pikachu he has grown into one of the strongest Pokémon I was proud to fight..."
With that said, Mewtwo's body then faded into light and disappeared, filling the area with gloom at the loss of an innocent life, which caused Serena to wrap her arms around Ash, while she buried her head into his chest and cried.
Takato and Rika looked down in sadness, Renamon put her head on Guilmon's shoulder, while Pikachu slowly opened his eyes and found himself in Lucario's arms.
"Lucario... you're alright..." Pikachu said, making Lucario smile and nod.
"Is it all over now?" He then asked.
"Yes, I am alright, and it is all over. You saved us all. Now Mewtwo can rest in peace." Lucario replied.
Hearing that she was ok and that Mewtwo perished with no regrets, Pikachu smiled and then fell asleep in Lucario's arms, to which she put his head on her breast, allowing Pikachu to use them like pillows, making her smile at seeing Pikachu's cute face as he slept and the way he would nuzzle her chest in his sleep, which tickled a little and filled her body with warmth.
Finally, it was all over.