[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!
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 .
Yes, that's it! I'll challenge her! [At least Ash is wanting to prove his efforts towards Diantha, much to Serena's shock]
In that case, I'll ask her to take care of Clemont for me!
That's even more ridiculous.
Professor, what's with that keystone you two were talking about before?
You see, a Keystone is crucial for a Pokémon to Mega-Evolve. The stone a trainer possesses is called a Keystone and the stone a Pokémon possesses is called a Mega stone.
[The gang notices that Diantha's Gardevoir has a Mega stone embedded in its pendant]
Hey look. Gardevoir is wearing a pendant as well.
That's Gardevoir's Mega Stone. Mega stones have many different names depending on the Pokémon that Mega evolves. In Gardevoir's case, its Mega Stone is known as Gardevoirite.
I see! As long as you have both a Keystone and a Mega stone, a Pokémon can Mega-evolve!
That's actually not enough. A Pokémon can't Mega-evolve unless the hearts of both trainer and Pokémon become one.
It means they need to have an exceptionally strong bond between them. [Hmm...seems to be a nice foreshadow...]
That's right! You're a keeper! [gets down on one knee...oh no, not again!] Won't you please take care of my brother?
You see, my brother is a bit shy, so I thought it be good if he married a dependable woman like you.
I wasn't joking! [Uhh...Diantha doesn't have romantic feelings for Clemont]
Excuse me, Diantha? Please have a Pokémon battle with me?
Ash! You must know that Diantha doesn't get much private time and here you are bothering her this way!
Yeah, but...I want to be a Pokémon Master so having a battle with you will be awesome because you're the Champion! Please?
Alright. I usually turn down unofficial battle requests, but you shared your chocolate cake with me. Just this once.
[inside her mind] He really cares about his Pokémon. Ash is a very passionate trainer. [In other words, she does see a lot of potential in Ash based on his passion]
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These quotes come from Wikiquote's Pokémon pages and are available under the Creative Commons Attribution-ShareAlike License .