Here how a True childhood friend stereotype react -------
(Ash is sitting sadly after his defeat against Viola! )
Ash : Viola so strong ! I wonder if I can beat her .
(Serena approach him with his Bag )
Serena : Jeez You seriously dumped about one defeat ! That not like you !
Ash : huh
Serena : Here , Don't wonder off without your bag ! shesssss I hoped you finally grow a brain by now . But your still the Kid who would thoughtlessly sneak into Prof Oak lad .
Ash: How do you know that ?
Serena : Because you use to drag me with you , Remember ?
Ash : Dragg You ! (Ash tries to remember & a flashback of a girl show up). Noway Your S-Serena .
Serena : Oh , You remember me ! That quite surprising for you to actually remember something.
Ash : B-But Serena , How did you become So girly
Serena : I ALWAYS WERE A GIRL YOU MORON .
(Serena hit Ash )
Ash : Nope , Your still the same Serena.
(Clemont & Bonnie show up ! Ash introduce them to Serena While she tease him again. Later they go to get Ash's Pokemon.)
Nurse Joy : Here , Your Pokemon are fine & ready .
Ash : Okay guy , Are you all ready for Special training ,
Pikachu : Pikaa
Serena : WoW , Your that you Pikachu .
Ash : Yep , He's my very first Pokemon & Partner .
Serena : Really ,
Wait , Didn't Prof Oak give Bulbasaur , Charmender & Squirtle to new trainer ?
Ash : Well , A lot happened !
Serena :
Let me guess , You were too excited and couldn't sleep So you wake up late . By the time you reach Prof Oak , all the Kento starter were taken But Prof Oak took pretty on you and gave you an Random Pokemon to start with !
Bonnie : Wow , Noway
Clemont : Did that what really happened Ash ?
Ash : (Embarrassed ) Well , it not entirely , I-I mean
Serena : Anyway , You must have to tough to look after that Boy , Aren't You Pikachu (Pet Pikachu's head )
(Pikachu nood his Head to Serena's response)
Pikacha : Pika Pi ka chu
Serena : (has a sly face) See , Even Pikachu agree with me !
Ash : W-well , let go for training .
(Ash fall against gust & having second thought. Serena approach with a Handkerchief)
Serena : Ash , Here !
Ash : Thank you !
Serena : Don't get so gloomy ! Remember how Others use to laugh at your dream .
Ash : I don't remember that much.
Serena : But they did ! But you always stand up & Say
''I will Never give up ! I can know I don't try'' . I kind off jealous off you for that .
(Ash look at Serena and break into laughter with Serena being Stunned )
Ash : Thank Serena , I got what I need .
Serena : Did his head hit a rock or something .
(Conversation between Serena & Alexa)
Alexa : Ash really motivated ! May be it cause off you .
Serena : (Blushed Tsundere face) Noway , He was always like that !
PS : I skip some part like showing Froko and meeting Alexa .