[As the episode starts, we see Ash and his friends look at a poster promoting an exhibition match between two trainers. One of the trainers looks familiar to the Kalos residences...]
It is! Diantha is doing an exhibition battle!
Awesome! Alright! So... who's Diantha anyway?
[everyone faces faults]
HOW CAN YOU NOT KNOW WHO SHE IS?!
She's the strongest trainer in all of Kalos, that's who!
DDedenne
Ne-ne-ne! [Now you know!]
Diantha the Champion, huh? I'm psyched!
Not only is Diantha the champion, she also happens to be a world-famous movie star!
Just have a look up there! [motions towards a movie poster above the gang's head which features Diantha]
That's her in the blockbuster, My Sweet, Sweet Lady.
[The title card comes up]
[voiceover] Summer of Discovery!
[Team Rocket, dressed as chefs, are pushing trolleys of food when they see Ash and his friends with Professor Sycamore and his assistant, Sophie]
As we thought, the twerps did make the scene.
We hit that on the head. With the professor as host, their appearance was a must.
Let's take it slow. And at the right time, we'll whisk all their Pokémon away in one fair swoop.
Working to earn everyone's trust is a must.
MCMadame Catherine
YOU! [Team Rocket turn back to her]
Ah, Madame Catherine, you're right on time.
We're just getting our gourmet preparations underway now!
MCMadame Catherine
Good, no skimping, please. Keep in mind, Augustine's Trainers have giant appetites and just love to eat. Prepare a ton of food at least.
MCMadame Catherine
And if they really like which you all cook, there might just be a little rice in store.
Ahhh! Yummy! [They bow their heads]
[Meanwhile, Ash and his friends are with Professor Sycamore and Sophie and Ash is concluding his story]
And that's what happened.
Mmmm. Wow! Great! What a marvellous experience. You met Mega Lucario?
Mega Evolution is as cool as it gets.
[A flashback featuring Mega Lucario begins]
[voiceover] Everything powers up, including the strength of their moves. It's awesome how strong they get.
[The flashback ends]
I wish I could've seen it too. So I guess you'll be battling Korrina and that powerful Mega Lucario at the Shalour Gym soon?
You bet! The stronger my opponent is, the more fired up I get. I'm gonna win that Gym badge for sure.
Well, I hope your stay here will be useful and marvellous at the same time.
[Soon, Sophie is showing Ash and his friends to one of the cabins situated at the Pokémon Summer Camp]
SSophie
This is the cabin you'll be staying in.
[with stars in her eyes] Mmmm, it's the cutest!
SSophie
Everyone will be split into teams. As you can see, your team is called "Team Froakie".
[Inside the cabin, Ash puts his backpack down as he, Pikachu, Clemont and Serena, check out the cabin. Bonnie and Dedenne, meanwhile, are sitting on the top bunk of a bed]
[Serena opens a window and checks out the sea]
Speaking of summer camp, does this bring back any memories of when you two first met each other?
Yeah, it does. Let's make it as much fun as when we were kids.
[Cut to outside the Dendemille Town Pokémon Showcase theater. People can be heard laughing as they hang out with their Pokémon and view billboards featuring elegantly dressed Performers and their partners in action.]
[off-screen] Look at all these people!
[Cut to our heroes and their Pokémon. Serena is looking for a place to register for a chance to redeem herself after her loss at the Courmarine City Showcase.]
Let's see... where do I register?
MMiette
[off-screen] Serena! Is that you?
[Miette is present with her Slurpuff and male Meowstic.]
MMiette
Long time, no see, everyone!
[Ash, Clemont, and Bonnie walk closer to greet her.]
So, how have you been, Miette?
Hi, Slurpuff! Good to see you!
SSlurpuff
[greeting] Slurpuff!
You're a Meowstic, right?
MMeowstic
[greeting] Meow!
So, are you entering the Pokémon Showcase, too?
MMiette
Of course, how could I not enter?
I'm not surprised-- [Miette approaches her closely.] Huh?!
MMiette
Hmm, you cut your hair.
MMiette
[Leans toward Serena's ear.] So, why did you do that? Something big happen in your life?
[This question causes Serena to back away and blush, as it is obviously about her crush on Ash.]
[squeaks] What are you talking about?! [She instinctively turns toward Ash, who giggles.]
[enjoying the fun] Pikaaa!
Forget that! I'm all ready to compete in this performance, and I'm not going to lose like I did with the Poké Puffs!
[Braixen and Pancham sound their agreement.]
MMiette
Well, the same goes for me. Now, hear this! [She points her finger at Serena.] We are going to settle things once and for all! And then... [leans into Serena's ear] remember, I told you I might have a chat with Ash~. [Serena becomes flustered again. Miette runs toward the arena and giggles.] Later! Bye!
[Cut back to our heroes. Ash, blissfully unaware of his place in their rivalry, is happy that Miette shares the same energy, while Serena, still blushing, is irritated that Miette can be such a tease to her. On the other hand, Clemont is confused about the whole ordeal, while Bonnie gives off a devious smile, indicating she knows for certain that Serena has a massive crush on her childhood friend!]
Miette sure seems ready to go.
[turns towards Ash] I'm ready to go, too!
Right! That's the spirit, Serena!
[in motivation] Pika-pika!
[shrugs] Ash can be so dense... [Clemont turns towards her.]
Bonnie, what are you talking about?
Of course, you're the same.
What'll it be, Greninja...?
[Greninja turns around and closes its eyes in a serious manner.]
[solemnly] I know. What happened before can never happen again.
[Greninja nods to Ash.]
Remember what Professor Sycamore said?
[A flashback of Greninja taking Pikachu's deflected Electro Ball to keep Pikachu healthy as a Froakie plays out, followed by the scene where Ash rushes to Sycamore's lab with it barely conscious in his arms.]
That maybe... it wasn't a coincidence that I met you way back when you were still a Froakie. I think that maybe, he was right. It wasn't a coincidence.
[Flashbacks of Froakie evolving into Frogadier and later defeating Anistar City Gym Leader Olympia play.]
That when you and I power up, it isn't an accident. Maybe your power was always meant for this moment.
[Flashbacks of Frogadier evolving into Greninja, battling Sawyer's Sceptile, and saving a Spewpa in the Winding Woods, followed by it and Ash shaking hands, play.]
Thanks. You always became stronger to help someone else. So now this time, you'll help Kalos and the world!
It's like something's telling you that what you need to do now is find all that negative energy! Don't worry! We'll always be connected, even we're not in the same place!
The truth is, we won't ever really be apart.
This is what you've gotta do!
GGreninja
[nodding its head in understanding, realizing the future of the world of Pokémon lies in its hands] Gren.
[It walks up to Ash and extends its arm out, then Ash and Greninja clasp hands and embrace.]
[emotionally] Oh, Greninja...
GGreninja
[emotionally] Greninja...
[Serena, Clemont and Bonnie watch on distraught as Greninja turns away from Ash and walks towards Squishy and Z2.]
[with tears in his eyes] That's right. This is how it has to be.
GGreninja
Greninja. [It extends its arm to Squishy.]
SSquishy
[telepathically] Thank you.
[to Ash] Ash, Greninja will be in my care.
Yeah! I'm counting on you, Squishy!
[concerned about the future of her and Squishy's friendship] Hey, Squishy...?
SSquishy
We probably won't see each other for a while, Bonnie...
[almost breaks down crying, but is suddenly cheerful through her tears] It's okay! I know that you've got a lot of important work to do! I'll always be cheering you on, you know?
SSquishy
I'll always be with you too, Bonnie.
I'll come and find you when I become a Trainer! We'll be together again, that's a promise!
DDedenne
[emotionally] Dedenne!
SSquishy
Yes, that's a promise!
[Dedenne and the rest of Ash's Pokémon express their farewells to Squishy, Z2, and, most importantly, Greninja]
Take care of yourself, Greninja!
You too, Squishy! Take care!!
[Greninja holds Squishy in its hand and looks back as it leaves Ash and his friends]
Greninja and Ash may be parting ways, but this also means the beginning of new encounters! In search of their own new encounters, our heroes will no doubt experience many new and exciting adventures, as the journey continues!
[Dedenne, not wanting to say goodbye to Ash, Serena, and their Pokémon, has run off, sending the gang in a chase around Lumiose Airport. Using Pikachu's electricity, they find it hiding behind a conveyor belt's TV screen.]
[concerned] Pi... Pika-pika!
DDedenne
[startled] Ne... Ne-ne-ne?!
Dedenne! Dedenne, come out! I'm begging you!
DDedenne
[in protest] Ne... Ne! Denne! Dene-nne!
Dedenne, you've just got to come out here! Please?
DDedenne
Denne-denne! [breaks down crying]
I know why... Dedenne doesn't want to say goodbye to everyone.
DDedenne
[coming out of hiding] Dedenne... Dedenne! [jumps emotionally into Bonnie's hands]
DDedenne
[apologetically] Denne-ne-ne-ne...
Hmmm... [nuzzling Dedenne] It's okay~...!
[Everyone walks toward Bonnie and Dedenne.]
Dedenne, you can help Bonnie make her dreams come true!
You'll see! We'll battle!
I know I'm gonna have to do my best, or you'll beat me!
None of us wanna lose to you!
[All the Pokémon voice their agreement.]
[Bonnie and Dedenne laugh.]