In the Shinobi World, Pikachu and Sylveon was still running in the forest while following Ash's scent in order to find him.

Pikachu: Find anything, sweetheart?

Sylveon: The scent is pretty strong, as if he is sweating too much.

Pikachu: Sweating? Could it be that he is fighting someone to his last sweat?

Sylveon: Maybe. Based on how strong the scent is, the fight he is having is pretty tough.

Pikachu: Then we better hurry so we can back him up!! He needs us!!

Sylveon: Roger!!

https://youtu.be/AU3O16wuzaI

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In the Pokemon World, Sasuke was walking down to the floor where his students are training. He could see that they are pretty serious at it.

Sasuke: .... (All of you...)

He bring out his Uchiha Blade that was still attached into it's scabbard and then he taps it on the ground to get everyone's attention.

Sasuke: Everyone, please stop what you are doing and listen up.

Everyone starts lining up in front of him to listen what he has to say.

Sasuke: Alright, today I would like to confess something to all of you today.

Chairo: What is it, Master?

Sasuke: ....

Meanwhile, Yuri was hiding behind the stairs, listening while not being notice by anyone.

Yuri: *Smiles* Go for it.

Sasuke: *Sigh* But before I tell you all, I want to set up an survival training for all of you.

Shiro: Survival training?

Sasuke: Yes, this training determine where you are ready to face the real harsh world without me or not.

Kiro: Wow

Sasuke: This training, will be our last to give it our all.

Everyon gasps at the same time by the statement that Sasuke give.

Aoi: Our last...

Mizu: To give it our all?

Rai: You don't mean...

Sasuke: Yeah, I'll be using my perfect form Susanno'o and my rinne-sharingan to fight you all. No more holding back.

Everyone was in fright by what he told them, they never face his perfect form Susanno'o before, they are only able to fight his half form Susanno'o.

Sasuke: Don't be scared, all of you had been fighting to the end. So I know this training will prove all that, just don't ever think of showing off.

Chairo: R-Right...

Sasuke: That's all, we meet up in the forest for the training in 5 minutes.

He then leave the shrine to prepare for the training.

Yuri: ...Hehe, smart move, Sasuke.

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In the Shinobi World, Pikachu and Sylveon keep following the scent before they arrived at a place where there is some various springs with bamboos sticking out of it.

Pikachu: Wow, what is this place?

Sylveon: Looks like some odd springs, but I can scent Ash's scent pretty close from here.

Pikachu: Then we might as well be searching.

The pair went off to find Ash together, but it's hard for them to see because of the steam.

Pikachu: He could be anywhere...

Sylveon: Look! Over there!

Pikachu: Huh?! Where?!

Sylveon point out at where she is looking and they were very shocked, it was Ash. He was sitting beside a spring and he was sweating too much because of the heat.

Pikachu and Sylveon: ASH!!

Ash: Hm? *Turns around* Oh! Pikachu! Sylveon!

They all starts running to each other before the pair tackles him for a big hug.

Pikachu: I'm glad you are save!!

Sylveon: We were so worried about you!!

Ash: Hehe, it's okay guys. I'm alright.

Pikachu: We were worried sick!! Naruto didn't even come to pick you up when you were away for too long!!

Ash: Huh? But—

Sylveon: Yeah!! We're so glad you didn't get involved into a fight!! How could he just sent you out on a journey on your own!?

Ash: Guys!! Please listen!! I can explain what's going on.

Pikachu and Sylveon: Huh?

Ash: Well, you see...

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Ash: Observation mission?

Naruto: Exactly, I want you to observe this hot spring and report back to me, since my client requested so they could open a new hot spring.

Ash: (Hot Spring... now those words remind me of something...)

Naruto: I also heard because of the healthy steam that the spring that the hot spring has, it's actually a perfect training ground for those who want to work out in a short time.

Ash: Wow! Can I train there, Naruto? Pleeeaaaseeeee?

Naruto: Well, your mission is just to observe so I guess you have my permission to stay there for some time, but only for one day.

Ash: Thanks Naruto!

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Ash: And that's what happened.

Pikachu: .....We should really listen to Naruto once in a while.

Sylveon: Agree.

Ash: Say, since you guys are here, why not we start our training?

Pikachu: Well, I'm up for it!

Sylveon: Me too!

Ash: That's the spirit!

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In the Pokemon World, Sasuke has gathered all of his students in the middle of the forest to start their training.

Sasuke: Remember, I'm not holding back anything.

Chairo: Yes, Master.

Sasuke: Now... let's begin!

Sasuke activate both his mangekyo sharingan and his rinne-sharingan before he summons the perfect Susanno'o with him in it.

Shiro: Th-That's huge...

Aoi: How... How are we supposed to fight that?

Chairo: Don't give up now, everyone!!

Rai: Huh?

Chairo: We all need to work together! That's the key!

Kiro: Chairo is right! If we want to defeat Master, we need teamwork!

Rai: We can't give up now! Because we got each other's back!

Sasuke: Good, they finally found the key to survive on their own.

Chairo: Girls! Use Aoi's sands to bring you up into the head and attack! Boys! We attack the bottom!

Sasuke's Pokemon: Roger!

Aoi summons some sand clouds and brought the girls up into the air.

Sasuke: You're wide open!

Sasuke's Susano'o pull out it's sword before it slash forward to attack the girls that was riding on the sand cloud and it hits.

Sasuke: Naïve.... Huh?

He soon realizes that they were actually sand statues riding on the sand clouds for decoys.

Sasuke: No way!

Suddenly a big chunk of sand was blown towards the room on the Susanno's forehead where Sasuke is to cover his sight.

Sasuke: What?! Where did...

Shiro: Now!!

A big blow of blizzard suddenly strikes the Susanno'o's head and it froze the sands that was covering Sasuke's sight.

Sasuke: They... froze the sand?! From where?!

All this time, they were at the same area but they were hiding behind the trees where he couldn't see them.

Mizu: Jackpot! Now's our chance!

The girls went off somewhere while both Kiro and Rai was charging up their special attack while Chairo quietly slithers some hard woods around the Susanno'o's legs.

Chairo: It's time boys!!

Kiro and Rai: Paralysis extravaganza!!

The two shots their powerful electricity power and it hits the Susanno'o really hard, even Sasuke got paralyzed.

Sasuke: I-I can't move!!

Chairo: Take this!!

The woods pull the Susanno'o's legs to make it fall backwards.

Sasuke: What the?!

Shiro: Here it comes!!

Shiro use volt tackle towards where Sasuke is and hits him through the Susanno'o really hard until it went through the frozen sand that was in front of him.

Sasuke: Gaaaah!!

Shiro: I'll... leave him to you...

Shiro fell down into the forest before he could see far behind him is Chairo, Rai, and Kiro. They are preparing a big seed bomb that was filled with strong electricity.\

Chairo: Get ready!!

Sasuke: I'm not letting you...

Sasuke uses his Rinne-Sharingan power to switch place with Chairo to make him flew into the air instead.

Sasuke: Take this!!

He was about to side-kick both Kiro and Rai that was still there, but when his leg hit, they suddenly turn into electricity that shocks his body. All this time it was a decoy so he can be paralyzed in place.

Sasuke: Graaaaah!!!

Chairo: Hehe, didn't see that coming in a quick time, huh?

Chairo land down and help Shiro up after she used volt tackle on Sasuke.

Chairo: You alright?

Shiro: Yeah! I can still keep going!

Chairo: Good. Everyone!! Let's strike the final blow!

Sasuke's pokemon: Yeah!!

All of Sasuke's pokemon jumps up from into the air above where Sasuke is before they starts to summon their best move to attack.

Sasuke's pokemon: Final blow!!

Suddenly everything became so slow for Sasuke before the attack strikes.

Sasuke: (All of you, well done. I guess there isn't any more doubt to not let you all go. Congratulation)

They then strike their final blow to Sasuke, creating a really big explosion on the forest.

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In the Shinobi World, Ash and his team was standing on their places to start their intense training.

Ash: This training will prove how strong we are!

Pikachu and Sylveon: Yeah!

Ash: Now remember, no holding back!

Pikachu: We won't!

Ash: Now... let's begin!!

Ash starts charging his electricity from his jacket before he shoots them towards them.

Pikachu: Dodge!!

Sylveon dodge the attack but Pikachu manage to counter the electric using electro ball and shoot it towards Ash.

Ash: Wo-oh!

He quickly dodge the attack then he uses wind wall jutsu to blow the two away along with the steam.

Pikachu: We have to keep hold!

Sylveon: Yeah!

After the wind wall slowly faded, Sylveon uses fairy wind towards Ash to counter the attack back to him.

Ash: T-Too strong!!

Suddenly he got blown away because of the intensity of the fairy wind and made him fall into one of the hot spring.

Pikachu: Got him!

Sylveon: Yeah!

But then Ash came out a splash the water towards the pair before he fire his electricity towards them to electrocute them.

Ash: Got you now!!

Pikachu and Sylveon: Aaaaaaahhhhh!!!!

The intensity of the electricity blow them away but Pikachu manage to land safely and grab Sylveon on his arms.

Pikachu: Y-You okay?!

Sylveon: *Blushes* Uhh.... Y-Yeah, thanks.

Pikachu: I guess we got no choice but to use that move.

Sylveon: You think it could defeat him?

Pikachu: Well, we only got one shot, so make it count.

Sylveon: A-Alright!!

Sylveon starts charging moonblast on Pikachu's paw and he starts charging it with electricity.

Pikachu: This'll finish things!

Ash: That move... I see, a combo move huh? Well I won't lose to that one!

Ash starts charging a lot of electricity into his fist to create a really strong electric punch.

Pikachu and Sylveon: Thunder Moon Blast!!

Ash: Blue Thunder Punch!!

Ash runs towards them while they fire their attack towards them before both of their attack collides, creating a big explosion around the hot spring.

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In the Pokemon World, the explosion that was caused by the final blow slowly faded, creating a huge crate in the middle of the forest. Sasuke was in the middle of the crate, lying unconscious.

Sasuke's Pokemon: Master!!

They all ran toward him before the girls starts healing him using their medical ninjutsu.

Chairo: Master!! Are you okay?! Speak to us, please!!

Shiro: Master!! Keep it together!!

Kiro: Master!! Wake up!!

Aoi: Master!! I know you are strong!!

Rai: Master!! Don't die on us, please!!

Mizu: Please Master! We beg you!!

Suddenly, Sasuke open his eyes before he slowly getting up while hissing in pain.

Sasuke: Ergh...

Chairo: Master Sasuke! You're awake!

Shiro: We're so glad you are alive...

Sasuke: ....Well done, all of you have done well in such short amount of time.

Kiro: We... we won?

Sasuke: Yeah, I guess I won't need to doubt your surviving skill. All of you are capable to live on your own when I released you all soon.

Without thinking, all of his pokemon starts cheering in victory. But not too long before they realized what he just said which made them stop cheering.

Kiro: R-Release...

Aoi: Us...?!

Sasuke: ...That was the thing I was about to tell all of you. After this world tournament is done and I can go back home, I have to release all of you back into the wild.

Rai: But why?! Can't we come with you?! You already train us, why do you want to release us?!

Mizu: Yeah! Aren't we really important to you?!

Sasuke: Listen, all of you are my precious students. But all of you are pokemon, the being that deserve to be free to find your real purpose in this world. I want you all to be independent without my leads, I'm sorry.

Everyone went quiet for a moment after hearing the truth that they have to face.

Chairo: No Master, you don't need to be sorry.

Sasuke: Huh?

Chairo: We appreciate your caring on providing us the best living, the right food, and our chance to become even stronger than before.

Shiro: We will never be children forever, we know that one day we will have to be independent.

Kiro: We understand that we can't be together forever, but that is just part of our destiny.

Aoi: Even without Master not being with us, we are sure to survive at any cost.

Rai: You might never come back again into this world, but we will always remember you as our Master and we will never forget what you have done for us.

Mizu: We promise to be independent and we promise to be friends with all sorts of people and pokemon in order to survive.

Sasuke was left speechless by what his students have said to him, he never knew that they will understand the choice he made. He then starts crying for a bit while smiling.

Sasuke: All of you... Thanks for the understanding.

Sasuke's Pokemon was also crying tears of joy before they starts hugging Sasuke to thank him.

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Meanwhile, the remaining of Ash's group was still in Serena's house while watching the news about the Pokemon World Tournament.

Clemont: Wow, all 8 regions trainers come to show off their skills huh?

Bonnie: So exciting! I bet Sasuke will show how strong his pokemon! I mean, he trained them super hard!

Serena: We have to cheer him on when that happens!

Clemont: Exactly.

While they all watches the news, Serena look out at the window to see the moon is at full moon.

Serena: (Ash, I hope you can win. I'll be cheering you on too)

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In the Shinobi World, Ash's team came back to the village at sunset, all wet after the fight.

Ash: Oh boy! That fight sure is refreshing!

Pikachu: Yeah! I guess we got what it takes to win the Chunnin exam!

Sylveon: Mhm! As long as we stick together and got each other's' back!

???: I see you guys are back.

They all look at who was talking, it was Naruto. He was waiting for them to comr back.

Ash: Naruto!

Naruto: Well you guys are making me worried, so I waited here.

Pikachu: Hehe, sorry for shouting you back in the mansion, Naruto.

Naruto: Don't worry about it. And here, I got something for you.

Naruto gave them a scroll that has the information of what the Chunnin exam will be.

Sylveon: Wow, this should be useful for us.

Naruto: Now remember, this Chunnin exam is harder than what my son has faced before. So don't hold back anything and be strong. Remember, the key to win is teamwork and discipline.

Pikachu: Roger that, Naruto!

Naruto: And how is the spring, Ash? Is it any good to open a business there?

Ash: *Sweatdrops* Ahahaha.... Yep, no problem at all.

Naruto: Good, work hard and good luck!

Suddenly he poof into clouds, the Naruto that was talking to them all this time was a shadow clone.

Ash: Well guys! Let's do our best so we can go back home!

Pikachu and Sylveon: Yeah!!

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To be continued

https://youtu.be/-LF_XhOdpnQ

Ash: Everything will be decided tomorrow.

Chairo: So many pokemon...

Sylveon: *Mumbles* This'll be hard

Sasuke: Don't go easy just because he is a youngster.

Next time on "The Missing Pieces: Pokemon and Naruto World"

"Start of the Big Test"

???: So, you are Sasuke Uchiha, correct?