The official Japanese Anime PR Twitter account announced on June 14th, 2024 that Lip would be voiced by Mariko Nagai and Haidai would be voiced by Yasuhiro Mamiya.

Pokémon Anime News:
In addition, Gym Leaders Lip and Haidai will appear during the Elite Four exhibition matches as well!
Lip, the Gym Leader of Bake Town, will be voiced by Mariko Nagai-san
Haidai, the Gym Leader of Carafe City, will be voiced by Yasuhiro Mamiya-san

アニポケ ニュース
さらにさらに、四天王交流戦には
ジムリーダーのリップとハイダイも登場
ベイクタウンのジムリーダー・リップ役は 永井真里子 さん
カラフシティのジムリーダー・ハイダイ役は 間宮康弘 さんです

The official Japanese Anime PR Twitter account posted a special illustration for this episode on June 14th, 2024 by Akira Komayama.

AniPoke Special Illustration released
In episode 56, airing Friday June 28th, we'll get Liko & Kaede VS Chili. We present a special illustration by Akira Komayama-san!
The Pokémon Anime airs every Friday at 6:55pm on the TV Tokyo Network (airdate and airtime may vary depending on region)! Episode 46-54 are all currently available to watch on Youtube!

アニポケ 特別イラスト公開
6/28(金)放送の第56話はリコ＆カエデ VS チリ
こまやま明(@Akira_Komayama)さんによるイメージイラストはこちら！
アニポケは毎週金曜よる6時55分～
テレ東系で放送※一部地域では放送日時が異なります
第46～54話は一挙配信中