In the shinobi world, Ash and his friends was training at the training field to incrase their focus on their formation

Ash : Let's do this again, but remember I won't go easy on you two.

Pikachu and Sylveon : *Nods*

Ash : Okay.

The pair of them prepare to attack Ash and so as him.

Ash : Okay, let's go. *Sprinting towards them*

Pikachu : PIKA !!! (ALRIGHT !!!) *Sprinting towards Ash*

Sylveon : Syl Sylveon !!! (Right behind you !!!) *Running behind Pikachu*

As they running towards each other, they put out a kunai at each of their hand and they bursting towards each other kunai.

Pikachu : *Smiles*

Suddenly Pikachu dissaperd and leave only Sylveon holding.

Ash : (He's dissaperd ?)

Pikachu was actually telepored behind Ash and preparing an electric attack towards Ash.

Ash : (Behind ?)

But Ash can't move because a tiny sand burial that buried his legs because Sylveon.

Ash : (Darn it)

Sylveon : Sylveon !!! (Now !!!) *Jumped back*

Pikachu : PIIIIKAAA !!! (HYAAA !!!) *Throw his electric kunai towards Ash*

Ash : (Oh no !!!)

The attack hit Ash and made a big electric wave around the attack.

Pikachu : (Is that done ?)

But suprisingly it was a substition log that got attacked.

Pikachu : (Substition ?!)

Suddenly Ash appear behind Pikachu and try to attack him.

Pikachu : (This is bad) *Block the attack with his kunai*

Ash bursting Pikachu and send him flying towards Sylveon.

Sylveon : SYLVEON !!! (PIKACHU !!!)

Sylveon felt really angry and shoot a moon blast towards Ash.

Ash : Hm... *Use the electric arm to grab and block the moon blast*

His electric arm and the moon blast was bursting each other but Ash manage to fully grab the moon blast.

Ash : Take This !!!! *Throw the moon blast towards Pikachu and Sylveon*

Sylveon : (Oh My Arceus !!!) *Grab Pikachu with her ribbon and jumped to dodge the moon blast*

The moon blast exploded but Sylveon manage to dodge it.

Ash : Great move guys

Sylveon : *Smiles*

Pikachu : *Stand up and smiles* Pikachu. (Heh thanks).

Ash : This time we have to give everything that we can !!!

Pikachu and Sylveon : *Nods*

Ash fully charge his electric arm and his friends recharged the power ball combo.

Ash : Okay, don't giving up now !!!

Pikachu : Pika !! (Alright !!)

Sylveon : Syl !! (Okay !!)

Then Ash prepare to sprint towards Pikachu and Sylveon.

Pikachu : We should give our best, okay Sylveon ?

Sylveon : I'll do anything for my love.

Then without fear, Ash runs towards the pair to attack them.

Ash : HERE I COME !!!

Pikachu : (Yosh) *Sprints towards Ash and points his attack towards Ash* PIKACHU !!! (COME !!!)

Ash's electric arm looked like it was dissapered but it's actually making a warp in front of his hand.

Ash : ALRIGHT !!!!

Both of the attack is bursting towards each other and making a big wave around them.

Pikachu : (Ish .... I will not lose)

Ash : I ..... I WILL NEVER GIVE UP !!!

Ash's attack gotten stronger and made Pikachu almost pushed.

Pikachu : (I'll ... SURPASS YOU !!!)

Pikachu's attack gotten stronger as well but the attack still bursting each other.

Ash : HUUUUUAAAAAAAAAAA !!!!!!!!

Pikachu : PIIIIIIIIIIIIKAAAAAAA !!!!!!!

The attack exploded and pushed Ash and Pikachu too far, but as they pushed Pikachu land on Sylveon and Ash stopped because crashing on the log.

Sylveon : You okay Pikachu ?!

Pikachu : Huff .... Huff .... Yeah ..... Huff ... Huff ....

Ash was try to standing up and grab the log to help him stand up.

Ash : Huff .... Huff .... Huff ....

Sylveon : 😦

Pikachu : 😐 *Struggle in pain*

Ash : *Raise his fist* ✊

Pikachu and Sylveon : 😮

Ash : ALRIGHT !!!

Pikachu and Sylveon : 💧?

Ash : That's the best training ever !!!

Pikachu : (He likes it) ☺

Sylveon : (Stupid) 😊

Ash : Okay, let's go eat. I'm hungry !!!

Pikachu and Sylveon : (He always thinks about food huh ?) 😅

After the training, they go home to get some breakfast.
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In the pokémon world, Sasuke and his pokémon was on a big field to train his pokémon.

Sasuke : Okay, I'm going to train all of your ability. But first ......

Sasuke put out a timer clock, and three tiny bell.

Sasuke : I have three bells in my hand and all of your goal is to get one of the bell, but I only have three bells and there is the four of you. That means....

Chespin : (One of ...)

Emolga : (Us ...)

Shiny Sylveon : (Will ...)

Pikachu : (Fail ...)

Sasuke : Yeah ... one of you guys will fail. In other way, the one who fail will not be my pokémon no more.

The wind breezing, that made a sign that something bad will happened.

Sasuke : Ok, let's start. Ready .... Go. *Activate his sharingan*

The start was suprising because Emolga jumped to punch Sasuke's face, but Sasuke manage to dodge it because of his sharingan.

Sasuke : I see .... near range attack huh ?

But as he dodge, his feet is stuck because of the sand by Shiny Sylveon.

Shiny Sylveon : Got him !!!

Pikachu : Here I go !!!

Pikachu use his iron tail but Sasuke manage to block with his sword.

Chespin : (Okay) *Runs towards Sasuke's bells*

Sasuke notice Chespin and switch teleported by using his rinnegan. Instead, Chespin crashing into a rock.

Sasuke : You have to be much faster to beat me. *Nonactivate his rinnegan*

His pokémon think a new plan to get the bells, but it came to fast untill Sasuke do one thing that made everything difficult.

Sasuke : Let's just made this a little hard. *Activate 1/2 phase susano'o*

Sasuke's pokémons : (Susano'o ?)

Sasuke : Fire style : fire ball jutsu !

Suddenly Sasuke inhale alot then blow a ball of fire out of his mouth directly to his pokémons.

Chespin : That's big

Emolga : Dodge !!!!

The four of them manage to jumped and dodge the fire ball.

Chespin : Okay, this is my change !!!
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Sasuke : (It's time for the four of you ..... to give what I've been train you guys the whole time.) *Smile*
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Chespin jumped above Sasuke and some of the grass from the field is assemble on his hand and create a grass shuriken.

Chespin : (Thank you ..... Master Sasuke) *Throw the grass shuriken towards Sasuke*

Sasuke manage to block with his Susano'o.

Sasuke : Chespin : Grass shuriken.

Suddenly some more sands is gathering and making some sands arms, then hits Sasuke's susano'o but it doesn't do anything.

Sasuke : Shiny Sylveon : Sand User.

Then Pikachu runs towards Sasuke right aside him and at the same time some electricity is gathering on his hand and making an electric sword, then attack Sasuke's susano'o but Sasuke manage to block the attack with his sword.

Sasuke : Pikachu : Thunder Sword

Pikachu pushed by Sasuke's defence then Emolga runs behind Sasuke to prepare her attack.

Emolga : (Master Sasuke, even if I were new. You work hard to train me .....)

A tear came out of her eyes then her jutsu prepared.

Emolga : (Thank you) EMOLGA !!! (HYAAA !!!)

Sasuke : Emolga : Electric Shurikens Breeze.

Emolga blew her electric shurikens towards Sasuke's susano'o using her wings. But his susano'o too strong even if the shurikens hits his susano'o too many times.

Emolg : It doesn't work.

Sasuke deactivate his susano'o and he ended the training for now.

Sasuke : Okay, enough for now.

Sasuke's pokémon : Huh !?

Sasuke : We continue this training tommorow, but...

Sasuke pokémon : ?.....

Sasuke : I'm going to fight the four of you .... a real fight.

Sasuke pokémons : (A real fight ?)

Sasuke : Don't worry, *grab his pokéball* I won't go easy on you guys.

Sasuke pokémon : *Glup*

Sasuke : Return....
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In the shinobi world, Ash was walking home just from the store to buy some boxes of bento for his friends.

Pikachu : They will love this bento, especially Pikachu because his bento is filled with a lot of ketchup.

Suddenly a white haired man just bumped towards Ash that made his bag of bento falled and so does he.

Ash : Ouch....

??? : Oh, sorry. I'm in a hurry, here I helped you.

Ash : No, it's okay.

The man helped Ash to get up and retrive the bento, luckly the bento didn't spiled or mixed.

Ash : Thanks. By the way, I'm Ash. Nice to meet you.

??? : I'm Hatake Kakashi, the sixth hokage.

Ash : The sixth hokage, the hokage before Naruto right ?

Kakashi : Yeah, so you know Naruto huh ?

Ash : He helped me out a lot since I got sended here.

Kakashi : (Naruto, you never changed huh ?)

Ash : Kakashi....

Kakashi : Huh ?

Ash : Kakashi.....

Ash remember a few days ago Pikachu and Sylveon told Ash that they got helped by someone. Even if Ash can't understand their language, the pair write what they want to say thanks to the books from Konoha Library.

Ash : Oh... you're the Kakashi that save my friends.

Kakashi : Hm ?

Ash : You know, when it was snow and you save a yellow mouse and a pink fox from three samurai.

Kakashi : I see, Ah !

Ash : Huh ?!

Kakashi : I've meet you're friends before.

Ash : So you know ?

Kakashi : Yeah. Don't worry, it's going to be fine.

Ash : I'm so glad.

Suddenly an incoming call is coming at Kakashi's headset.

Kakashi : 👆 Yeah ?

??? : Senpai !!! The meeting is almost begin, where are you ?!!!

Kakashi : Yamato, don't worry. They can't begin the metting without me.

Yamato : That's why you have to come quick !! The seventh is asleep because of you and that made his drowl almost filled the meeting table !!

Kakashi : 💧Okay, I'll be there.

Kakashi close the call and he confuse because of what happened.

Kakashi : Because of you, I'm late for my meeting.

Ash : HUH !!! I'M SORRY 😢

Kakashi : Don't worry, it's not you're fault. I have to go, bye.

Ash : Yeah, bye.

Kakashi levae Ash then Ash walked home to his house.

The meeting room

Kakashi : Sorry I late.

Daimyo : Yeah, it's okay. Let's just begin this meeting.

Kakashi : Wait ☝

Kakashi walked towards Naruto who was asleep and stands beside his chair.

Kakashi : Wake up ! *Punch Naruto's head*

Daimyo : You don't have to do that !!!

Kakashi : Oh, he fainted.

Everyone : WOI !!!

Time skip

Naruto : Sorry, so let's begin. The eternal genin Kosuke Gramps just predict the Hidden Leaf Village's future, but... he passed.

Shikamaru : Huh.... (Kosuke-san...)

Everyone got silent because they just knew Kosuke's death.

Naruto : But, Kosuke Gramps left one thing before he passed by sending me this.

Naruto show a big piece of paper writen by Kosuke that said....

Everyone : The Hidden Leaf Village .... Will Be Destroyed ?!!

Everyone suprised because of the perdiction.

Daimyo : So what ? Is that something we need to fear ?

Naruto : Daimyo-sama, this is serious. And there is one more thing.

Naruto play a video of his memories when he fighting the myterious man.

Naruto : He is the only person that almost surpass my power, and he said he would kill me. That means.....

Shikamaru : If a hokage died...

Kakashi : The village will be easy to destroyed.

Daimyo : Oh no, that's bad.

Naruto : There is still more, he's....

He played another video shown when the mysterious man open a portal showed Sasuke was sitting on a bench.

Sai : Sasuke ?!!!

Shikamaru : No way ?!

Naruto : Yeah, he's....😡 he's the one who send Sasuke somewhere else !

Daimyo : Naruto, you need to calm. Anger can't help us win.

Naruto : Yeah, so I have one job for all the Hidden Leaf Village.

......

Naruto : Brought him to me alive to change the future.

Everyone understood then close the meeting.
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In the pokémon world, Sasuke was at Serena's house to eat lunch with his pokémon.

Sasuke : (They didn't look to save, I think the day has come)

Sasuke didn't finish his lunch and just walk away while he been spotted by Serena, Clemont, Bonnie, and Grace.

Sasuke : I'll be back.

His pokémon notice and follow Sasuke as they get out.

Clemont : (What is he up to ?)

A few moments later, Clemont follow Sasuke throught a forest.

Sasuke : I knew that was you, Clemont.

Clemont stopped and shivering.

Clemont : What are you going to do ?

Sasuke : I won't tell you, it's only me and my pokémons business.

Clemont : Tell me !! Or your only key to get out of this world will never achived.

Sasuke didn't and still walking away.

Clemont : Don't you get it, if you give something to give more strength to your pokémons then it'll be illegal.

Sasuke keep walking away but much more faster.

Clemont : Like weapons, drugs, pills, machine, or curse.

When Sasuke heard the word "curse" he stopped walking and Clemont as well.

Clemont : Don't tell me, you give them curse ?

Sasuke : SHUT UP !!!

Sasuke use his 1/2 susano'o to grab Clemont with the susano'o arm.

Clemont : Argh !! What are you doing ?

Sasuke looked really dark and he activate his mangekyo sharingan and looked at Clemont.

Clemont : You.... don't tell me.... you want to burn me with you're amaterasu ? 😢

Sasuke : .....

Clemont : Okay... just do it. 😔

Sasuke suprised about what Clemont say.

Clemont : I.... betrayed my friend, just like you. I..... lied between my friend, just like you. That's why.... I rather died than lived between all the lies.

Sasuke : .......

Clemont : 😔

Sasuke : I know how that feel.

Clemont : Huh ?

Sasuke put down Clemont and nonactivate his mangekyo sharingan and his susano'o

Sasuke : I don't know what came over me, I just want to protect my pokémon by giving them curse mark.

Clemont : Curse mark ? Ain't that illegal ?

Sasuke : Yeah, but that curse mark only active when they in trobule, not in a battle.

Clemont : Really ? Okay, what a relief.

Sasuke : Okay, I have to go. But, don't tell anyone.

Clemont : ...... Yeah.

After that, Clemont walked away and so as Sasuke.
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In the shinobi world, Ash and his friends was at the training field to train with Naruto.

Naruto : Huff...... Huff..... You guys getting stronger huh ?

Ash : Huff... Yeah.... That's because of you..... Huff..... Naruto.....

Naruto : Okay, I think we have to end the training here.

Ash : Huh ? Why ?

Naruto : There is something I need to give you guys.
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Sasuke : This place should be fine.

Sasuke was at a dark part of the forest.

Sasuke : C'mon out, my students. *Throw all his pokéballs*

After they pokémons get out of their pokéballs, they got suprised and scare because they were in a dark part of the forest.

Emolga : Huh ? This....

Chespin : N.....No way.....

Chespin remember the place that Sasuke drag them to.

Chespin : Irgh... ARGH !!!

Emolga : Chespin ?! What's wrong ?

Chespin : Huh....Don't worry, I'm fine.

Sasuke put down a lot of candle around them in circle.

Sasuke : This ceremony will start.....

Sasuke's pokémons : Huh...?

Sasuke : Summoning jutsu.

Sasuke summons the cursed barrel that once cursed him before.

Sasuke : Everything is ready.
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Ash : Give us something ? What ?

Naruto : The power that always protects me.....
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Sasuke : .... And keeps me safe....
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Naruto : ..... From dying.
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Chespin : Keep him safe ?

Emolga : From dying ?

Pikachu : Does that mean....

Shiny Sylveon : That the power is so great ?
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Naruto : That's right, Ash. But this would only last untill you come back to your world.

Ash : Okay, I'm ready for the worst so me and my friends can come home.

Naruto : Okay.
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Sasuke : It's time.
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Naruto and Sasuke : I'll give my power to you.
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Naruto activate his bijuu mode and put all his 3 bijuu mode arms on Ash and his friends shoulder.

(Naruto : Kurama, give them power. They really need it to protect themselve)

(Kurama : Yeah, but can they control it ? There are some hatred that aren't even erased from that power)

(Naruto : Don't worry, I'll take the responsibility)

Ash and his friends body start to fill with bubbling red aura and some three lines appear on their cheeks, their nails start to grow sharper, and four fangs appear on their teeth.

(Naruto : Not good, some haterd appear in that power)

(Kurama : Naruto, I'll help you out)

(Naruto : Thanks, Kurama 🙏 Let's go)

(Kurama : Yeah 🙏)

Naruto and Kurama try to control the powers from inside Ash and his friends body.

Ash : Grr...... argh.....

(??? : I will control this kid body, and I will get out)

Half of their aura is filled with some bubbling dark red aura that made their left eye glowing.

(Naruto : Just a little more....)

Naruto manage to control it, Ash and his friend turn back to normal and the aura is kept inside their body.

Naruto : Okay, done.

Ash : Huh ? What happened ?

Naruto : No nothing, let's go home.

Ash : Hm... okay.

They all went home but Naruto still didn't said the truth about what happened.
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Sasuke : Let's begin.

Four snake appear and shlittering on Sasuke's arm. Then snakes bite Sasuke's pokémon's left side of their neck.

Sasuke's pokémons : AAAAAAAAAAAAAAAAAAAAAA !!!!!!

Clemont : Huh ? No.... Sasuke can handle it.

Sasuke's snake bites so deeply, Sasuke's pokémons struggle so hard and lots of bloods dripping on the ground.

Sasuke : It's done.

Sasuke let go of his snakes and his pokémon fall on their kness hurting extremly.

Emolga : It hurts....

Chespin : Grh.....

Pikachu : Ouch....

Shiny Sylveon : huff.... huff....

Sasuke took out a tiny bottle of pils and give each one to his pokémon.

Sasuke : The four of you have this each, eat it.

Sasuke's pokémons grab one pil and eat one.

Dug dug.....

Pikachu : Urgh....

Dug dug.....

Pikachu saw one by one of his friends fall and he notice that they..... dead.

Dug dug....

Pikachu : They're..... dead.

Dug dug....

Pikachu saw Sasuke activate his sharingan and rinnegan.

Dug dug....

Pikachu : Master Sasuke...... why....?

Pikachu died in front of Sasuke and so as their friends.

Sasuke : They dead. Okay, next....

Sasuke walked and stand in front of the cursed barrel then activate a forbiden jutsu that made his pokémons get sucks inside the barrel.

Sasuke : Sorry, but I have to do this.

Time skip

Sasuke sits beside a tree near side the cursed barrel and eats his bento made by himself.

Sasuke : Is it working ?

Just as his finished his lunch, the barrel starts to glow some dark aura around it.

Sasuke : It is.

Sasuke stands up and suddenly the barrel exploded itself.

Sasuke : Eh...?

After the smokes gone, he saw his pokémons was struggle but trying to stands up.

Sasuke : Are they....

Suddenly his Chespin grab Sasuke's neck and made him fall on the ground, then Chespin strangled Sasuke to the ground.

Sasuke : I see.

He saw Chespin half of his face was all gray with some flames mark on the side and his left eyes turn yellow with black pupil on the middle, and thats all came from the cursed mark that's been given.

Sasuke : Hm.... Do your worst.

The rest of the three jumped and stabbed Sasuke by using their sharp body parts. But luckly it was a substition, then Sasuke appear besides them then 4 big white snake appear and stopped them from moving by sorrounding their body.

Sasuke : Control it, both of you.

Sasuke's pokémon struggling but their curse started to wearing off slowly.

Sasuke : Yes.... it's working.

Their curse mark mode wearing off then all of them fainted.

Sasuke : Huh, what a pain.

Sasuke returned them to their pokéballs and walked to the pokémon center.

Sasuke : I should give you guys a name.

Sasuke thought a good name for his pokémons and grab one by one of his pokéballs.

Sasuke : *Grab Chespin's pokéballs* You're name is.... Chairo.

Sasuke : *Grab Emolga's pokéballs* You're name is.... Shiro.

Sasuke : *Grab Pikachu's pokéballs* You're name is.... Kiro.

Sasuke : *Grab Shiny Sylveon's pokéballs* You're name is.... Aoi.

Sasuke felt happy because of the name and still on the way to the pokémon center.
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??? : .......You are..... dead.

To be continued

Naruto : The day has come.

Aoi : He's strong.

Ash : This is intense.

Shiro : NOOOO !!!!!

Next Time on "The Missing Pieces : Pokémon and Naruto World"

"The Upgrade"

??? : Dead....

Credits :

Cover : PotatoHusky

Happy now ? 😑