The Pocket Monsters Silicone Case for AirPods Pro in now available from Gourmandise. The silicone cover protects the AirPods Pro charging case as it's scratch and dirt resistant. The Lightning connector can be connected without removing the cover. It also includes an accessory hole for attaching a carabiner or strap. It it available with a Pikachu cover or a Metamom cover.

Product Details:

Pocket Monsters Silicone Case for AirPods Pro (ポケットモンスター AirPods Pro シリコンケース)
Product Number: POKE-698A / POKE-698B
JAN Number: 4550213050751 / 4550213050768
Size: H:127mm×W:98mm×D:26mm / H:127mm×W:98mm×D:32mm
Price: 2,728 yen each (tax included)
Release Date: May 2021

Sources: https://www.gourmandise.jp/shopdetail/000000005002 and https://www.pokemon.co.jp/goods/2021/04/210423_ph03.html?pokecen=0