On December 1st, 2023, the official Japanese AniPoke Twitter account reminded that this episode was available to watch on the official Japanese YouTube channel. The video was region locked to Japan only. It was available from December 1st, 2023 to December 15th, 2023. This episode was specifically labeled as a missed-program webcast (見逃し配信).

Note: The tweet says it was only available for a week but this was probably just a template copy and paste mistake as the YouTube page had a note saying it was until the 15th.

The episode was also available on the TV Tokyo YouTube channel and the Official Corocoro Channel and were labeled as limited-time delivery (期間限定配信). The TV Tokyo version included the series trailer at the end of the episode where as the Corocoro version had beginning and ending bumpers promoting Corocoro.

AniPoke Episode 31 The Song in the Mist
What did you think?
Behind the clearing fog was Laplace with a scar on its face.
So, who's this Laplace...
Next week's broadcast is also a must-see!
The missed stream will be available for 1 week from today!
Be sure to watch it!

アニポケ 第31話 「白い霧の歌声」
いかがでしたか？
晴れた霧の向こうにいたのは顔に傷を持つラプラス
果たして、このラプラスとは何者なのか…
来週の放送も必見です！
見逃し配信の公開期間は本日より1週間
ぜひご覧ください！

The official Japanese Anime PR Twitter account posted a wallpaper on December 1st, 2023 by #もじゃクッキー @mojacookie.

Anipoke Wallpaper Calendar
Every month we bring you a wallpaper calendar by mojacookie!
The cold weather is continuing.
It seems that everyone on the Brave Asagi is warming themselves with Lizardon flame on the cold days!
Something will happen on Friday, December 15th, 2023, the day with the sparkles!
(by #mojacookie @mojacookie)

アニポケ 壁紙カレンダー
毎月、もじゃクッキーさんによる壁紙カレンダーをお届け
寒い日が続きますね。
ブレイブアサギ号では、寒い日はみんなでリザードン の炎で温まっているみたいです
12/15(金)、キラキラマークの日の放送では何かが起こる!?
（ by #もじゃクッキー @mojacookie ）

The official Japanese Anime PR Twitter account posted pictures of Nanase Nishino holding an Eteboth plushie on December 2nd, 2023.

Nanase Nishino voiced Eteboth in Anipoke Episode 31! If you haven't seen it yet, you can catch the episode on your streaming services.
Eteboth will also appear in episode 32, which will air on December 8th, 2023 (Friday),
Please be sure to watch it!

アニポケ 第31話にて、西野七瀬 さん演じる エテボース が登場しました
まだ見てないという方は、ぜひ見逃し配信で
12月8日(金)放送の第32話にも、エテボースが登場するので、
ご注目ください！

On November 24th, 2023, the official Japanese Anime PR Twitter account posted a video of Nanase Nishino holding an Eteboth plushie to promote her role on the show for episodes 31 and 32.

We bring you a comment video from Nanase Nishino, a guest voice actress for the Anipoke!
She talked about the recording session for the episodes.
Nanase Nishino plays Eteboth in the Anipoke and she will appear in,
December 1st, 2023 - The Song in the Mist
December 8th, 2023 - Laplace's Thoughts For Its Companions
Please take a look!

アニポケ でゲスト声優を務める西野七瀬 さんのコメント動画をお届け
アフレコでのエピソードを語ってくれました
西野さん演じるエテボースが登場するアニポケは、
12/1(金)放送の「白い霧の歌声」
12/8(金)放送の「ラプラスの想い、仲間を想い」
ぜひご覧ください！

CoroCoro Comic's Official website posted an article about this episode just before the original airing on December 1st, 2023.


Anipoke is just around the corner! From air travel to sea travel!? The light shines brightly on Laplace's voice!!


Broadcasting every week from 6:55 pm! The anime "Pocket Monsters" will start airing soon! In this article, we'll introduce you to the Pokémon and characters that will appear in today's episode, as well as comments from the voice actors and director, and other information you won't find anywhere else!

Rumours of a "singing voice in the white mist" is spoken among sailors! The Rising Volt Tacklers have received information that its true identity is Laplace. Although they still do not know if the rumoured Laplace is one of the Six Heroes that Liko and her friends are chasing, it is highly likely that it is a special Pokémon! Immediately, they go full speed ahead to the area of the sea where the fog recently occurred, which Dot had investigated!


▲ The rumours say Laplace is guiding ships lost in the fog with its singing voice... They have no choice but to see it with their own eyes!!


▲ Diana once followed Laplace's singing voice by herself.


▲ Diana says she couldn't met Laplace by herself. But now, the Brave Asagi is here! They're sure they can catch up with Laplace!!

When they arrived at their destination in the sea, there was suddenly a white fog......!!! The rumours the sailors said were true! Does this mean that Laplace will appear in front of Liko and her friends too......! Then, out of nowhere, a mysterious voice sings......!!?


▲ The Brave Asagi, which usually flies in the sky, lands on the water and sets out on a journey on the sea in pursuit of Laplace!!


▲The fog has appeared... In the blink of an eye, the Brave Asagi is enveloped in the white mist.


The truth behind the "White Mist's Singing Voice" will be revealed later on Anipoke starting at 6:55!

【アニポケまであとちょっと！】空の旅から一転、海の旅へ!? 光かがやくラプラスの歌声!!
空の旅から一転、海の旅へ!?光り輝くラプラスの歌声!!
毎週よる6時55分から放送中！
アニメ「ポケットモンスター」まもなく放送スタート!!
この記事はアニメ放送前に、今日の放送回に登場するポケモンやキャラクターの紹介、声優さんや監督からのコメントなどなど、ほかでは聞けないアニポケ情報をお届けするコーナーだ!!
船乗りたちの間で語られる「白い霧の歌声」の噂！　その正体が光り輝くラプラスだという情報を得たライジングボルテッカーズ。噂のラプラスがリコたちの追っている六英雄のラプラスかはまだ分からないが、特別なポケモンである可能性は高い！　さっそくドットが調べた、最近霧が発生した海域へと全速前進！
▲霧で迷った船を歌声で導くラプラスの噂……。この目で確かめるしかない!!
▲かつて1人でラプラスの歌声を追ったことがあるというダイアナ。
▲ダイアナ1人では出会えなかったというラプラス。しかし今ならブレイブアサギ号と仲間たちがいる！　きっとラプラスにも追いつける!!
目的の海域に着くと急に白い霧が……!!　やはり船乗りたちの噂は本当だった!!　ということはリコたちの前にもラプラスが現れるのか……!?　するとどこからともなく不思議な歌声が……!!?
▲いつもは空を翔けるブレイブアサギ号も、ラプラスを追うため着水して海の旅へ!!
▲霧が出てきたな……。瞬く間に白い霧に包まれるブレイブアサギ号。
▲どこからか聞こえてくる歌声に反応するテラパゴス。やはり六英雄のラプラスなのか!?
ということで「白い霧の歌声」の真相は、このあとよる6時55分からのアニポケで！

The official Japanese Anime PR Twitter account posted a behind-the-scenes look at the making of this Anipoke episode with a production artwork piece on November 30th, 2023. The picture featured Kuwassu and Nyahoja.

An original drawing of Kuwassu and Nyahoja from episode 31.
Dot, who is concerned about Laplace, appoints Kuwassu as a cameraman!
Will it be able to take good pictures?

第31話より、クワッスニャオハ の原画をご紹介
ラプラス のことが気になるドットが、クワッスを撮影係に任命！
うまく撮影できるかな？

The original airing on TV Tokyo had a message above To Be Continued that said: After the commercials, The Glittering Records of Terapagos' Expeditions! (CMあとは、「テラパゴスのキラキラ探検記」！)