Heart-Pounding Diary

Heart-Pounding Diary (Japanese: ドキメキダイアリー Dokimeki Diary) is the first opening song of Pokémon Horizons: The Series. It debuted in HZ002, replacing Aim to Be a Pokémon Master -with my friends- of Pokémon Journeys: The Series.
It was produced by . The full version of the song was first performed during the Pocket Monsters Music Festival on March 31, 2023, and was released as a digital single on April 14, 2023.
==Opening animation==
===Synopsis===
Liko and are enjoying the breeze outside the Brave Olivine's observation room together. The camera quickly pans up to the sky and the series logo appears.
Friede enters the Captain's deck to check on Captain Pikachu and . A hardworking Orla wipes her forehead before exchanging a look with and . In the kitchen, Murdock's fills a bowl with cream as Murdock and are ready to make something out of it. Mollie is in the nursery with , , , , and , turning around in her chair as Chansey carries a tray to the opposite end of the room. Roy and skip and swing around together through a forest as various Pokémon they've encountered pass by in the opposite direction. Nidothing and dance and get up into the fourth wall. Ludlow is fishing in the sunset as a and three fly by him. 
At night, Liko has her coat off and is on her Rotom Pad. She pets Sprigatito before looking out her window at the moon. A transition of her singing along with uncertainty panning to the left turns the screen blue. The next scene starts with Liko's feet walking to the rhythm of Sprigatito's wagging tail, and then Roy's hat swaying the rhythm of Fuecoco's head swaying. Liko holds her pendant before letting go, causing it to glow brightly as the camera zooms out. Liko and Roy lay down on the battlefield, exhausted as their partners come to their sides and they exchange a laugh. The camera zooms out, with Friede and his Pokémon watching the two, and a shooting star crosses over the ocean.
Liko commands Sprigatito to use , which Roy has Fuecoco counter with . Orla, on her , and Murdock watch their battle. Mollie, Quaxly, and Ludlow are in the next scene. , and then Friede with Charizard, and then Captain Pikachu are in the next. Roy holds one of the ancient adventurer's Poké Balls, gazing up at the clear sky surrounded by clouds where the Black Rayquaza flies overhead. Amethio battles Friede's Charizard with his , with fire in Friede's eyes. In the meeting room, Murdock places mugs around as the other Rising Volt Tacklers come in and are impressed. Liko and Sprigatito face away from the fourth wall, standing before clouds moving in the opposite direction she is facing. Liko becomes surprised when the other Rising Volt Tacklers walk by her and towards the Brave Olivine. They all turn around to Liko, with Roy waving for her to come along. Sprigatito jumps on Liko's shoulder and nuzzles her cheek, and she runs to join the Rising Volt Tacklers.
The final shot shows all the Rising Volt Tacklers walking together in front of the Brave Olivine. Liko, Roy, and their partners are in the center with Charizard and Captain Pikachu above them. Friede, Orla, Dot, Ludlow, and Quaxly are on the right with Metagross flying above them. Murdock, Mollie, Chansey, and Rockruff are on the left.
===Characters===
* Liko
* Roy
* Friede
* Mollie
* Orla
* Ludlow
* Murdock
* Dot
* Amethio
===Pokémon===
* ()
* (Liko's; Rotom Phone)
* ()
* ()
* ()
* (Friede's; Captain Pikachu)
* ()
* (Orla's)
* (Orla's)
* ()
* (; )
* ()
* ()
* (Rising Volt Tacklers')
* (Rising Volt Tacklers')
* (Rising Volt Tacklers')
* (Rising Volt Tacklers')
* (Rising Volt Tacklers')
* (Rising Volt Tacklers')
* (Rising Volt Tacklers')
* (Rising Volt Tacklers'; Alolan form) 
* (Lucius's; Black Rayquaza; HZ007 - HZ025)
* 
* 
* 
* 
* 
* 
* 
* 
* (Paldean Form)
* 
* (×3)
==Lyrics==
===TV size===
! Japanese
! English
|-
| lang="ja" | <ab>
WOWOW
</ab>
| <ab>I'm starting to take a ride on this heart-pounding wave
I'll go far
There's a lot of things I can't really put into words
Things that make me sad, always troubling my heart
But somehow I'll know I'll shine on today
Look at the flowers blooming, now it's time to play!
I'm running through a everyday
I can't even find what I'm looking for (uh)
It's this super-duper energetic-looking diary
But I said, "what's this?" and then I threw it away
No way, no way, no way, no way, no...
My heart was so dark and empty then
Whoa-oh-oh-oh-oh-oh-oh
But now I know I can change "No way" to "It's possible"
Floating around on this feel-good wind
Even if it's gonna be really super tough
I'll try my best to fly!
And so, I'm riding on this heart-pounding wave!
But I'm sure that, yeah, yeah, yeah, yeah, yeah, yeah, yeah
I won't let stories I don't get scare me
In my sparkling daydreams, the world starts to dance!
So let's smile, yeah, yeah, yeah, yeah, yeah, yeah, yeah
Because there's no time to be afraid, yeah
I just wanna know myself!
Because there's still a lot, a lot, a lot I don't know, know, know, know
I just wanna find myself!
If I can find it in myself to say "I'm off now"
Then I guess I'll know I've grown up a bit</ab>
|}
|}
===Full version===
! Japanese
! English
|-
| lang="ja" | <ab>
WOWOW
</ab>
| <ab>I'm starting to take a ride on this heart-pounding wave
I'll go far
There's a lot of things I can't really put into words
Things that make me sad, always troubling my heart
But somehow I'll know I'll shine on today
Look at the flowers blooming, now it's time to play!
I'm running through a white fog everyday
I can't even find what I'm looking for (uh)
It's this super-duper energetic-looking diary
But I said, "what's this?" and then I threw it away
No way, no way, no way, no way, no...
My heart was so dark and empty then
Whoa-oh-oh-oh-oh-oh-oh
But now I know I can change "No way" to "It's possible"
Floating around on this feel-good wind
Even if it's gonna be really super tough
I'll try my best to fly!
And so, I'm riding on this heart-pounding wave!
But I'm sure that, yeah, yeah, yeah, yeah, yeah, yeah, yeah
I won't let stories I don't get scare me
In my sparkling daydreams, the world starts to dance!
So let's smile, yeah, yeah, yeah, yeah, yeah, yeah, yeah
Because there's no time to be afraid, yeah
I just wanna know myself!
Because there's still a lot, a lot, a lot I don't know, know, know, know
I just wanna find myself!
If I can find it in myself to say "I'm off now"
Then I guess I'll know I've grown up a bit, yeah
I'm nervous, so I'll take a deep breath
Everything feels like it's becoming way harder
There are no dreams written in my boring handwriting
Hey, I think I found the "me" that I hate
Wrapping myself in a everyday
Getting stuck in the rain, I just wanna go home (oh)
Back to my super-duper energetic-looking diary
Getting excited now, and I'm running off into...
Oh well, oh well, oh well, oh well, oh
Racing around, my heart is pounding
Whoa-oh-oh-oh-oh-oh-oh, I don't wanna lose my favorite accessories
Whoa-oh-oh-oh-oh-oh-oh, there's still so many things that I have yet to learn, yeah
Whoa-oh-oh-oh-oh-oh-oh, I wanna feel like this, always forever
I just wanna shine just like that star (ah)
I'm being captivated by this heart-pounding wave!
I knew it, yeah, yeah, yeah, yeah, yeah, yeah, yeah
It's all the fault of the answerless world I'm living in
Even if my future's super great, I'm not gonna change
So I'll yell "yeah, yeah, yeah, yeah, yeah, yeah, yeah"
I'm just gonna be me!
Before I get off this heart-pounding wave
Yeah, yeah, yeah, yeah, yeah, yeah, yeah
I'm waiting for my unknown story to be told, now
If I'm a little brave, who knows what I can change!
And hey, there's a really important story I gotta tell
About how I'm looking for something that's not quite here
So I'm heading off on a journey
And someday I know I'll return back home
By then I'll have grown up some more</ab>
|}
|}
==Variants==
#HZ002 - HZ006: The original animation. 
#HZ007 - HZ008: The part where Roy looks up at the sky adds Lucius's Rayquaza.
#HZ009 - HZ025: Dot added to final shot.
Sky scene
File:OPJ29 Roy with no Rayquaza.png|Roy looking up towards the sky 
File:OPJ29 Roy with Rayquaza.png|Lucius's appears in front of Roy
Final shot
File:OPJ29.png|Original Version
File:OPJ29 2.png|Dot added
==Videos==
 
==Trivia==
* This is the first Japanese opening featuring humans to not feature .
* This is the first Japanese opening not to be used in any dub, as the Asian dubs which had previously retained the Japanese opening replaced it with We Go (English Ver.).
* Among the first opening songs of all series, Heart-Pounding Diary has been used in the least amount of episodes before being replaced, at 23 episodes.
===Errors===
* In HZ002, the middle section of Mollie's jacket's left sleeve was incorrectly colored gray instead of red when she turns around to look at Liko. This was corrected in HZ003.
==Staff==
Storyboard 	
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* でんさおり
Director 	
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* 森山愛弓
Animation supervisor 	
*	
* 山崎玲愛
Key animators 	
* 
* 
* 
* 
* 
* 
* 
* 
* 
* 
* 
* 
* 
* 
* 
* 
* 
* 
* 
* 
*	
* 萩原慶汰
* 柳原好貴
* 高星佑平
* 松本めぐみ
* 辻早智子
* 宮沢聖麿
* 村司晃英
* 服部奈津美
* 森山愛弓
* 中道紘彬
* 正金寺直子
* 前並武志
* 大野泰江
* 忍田雄介
* 安田周平
* 海老沢咲希
* 酒井裕未
* 宮田忠明
* 松原徳弘
* 田中修司
* 伊藤京子
Second key animation 	
*	
* 有村奈美
In-between animation inspection	
*	
* 冨塚真理恵
CGI director 	
*	
* 川崎崇由
Assistant coordinator 	
*	
* 山口雄太郎
==Related articles==
Category:Japanese opening themes
es:OPJ24
it:Dokimeki Diary
ja:ドキメキダイアリー
zh:心動日記