The game itself. Unlike its counterpart Pokémon Sword , Shield features version-exclusive Pokémon (such as Galarian Ponyta and Tyranitar), the Ghost-type Gym Leader Allister, and the Legendary Pokémon Zamazenta. Understanding this distinction is key, as updates for Shield are often identical to Sword in content but are tied to different title IDs in the Switch database.
The update 1.3.2 for Pokémon Shield was released to address some issues and improve the overall gaming experience. Although I couldn't find a detailed changelog, updates typically include: Pokemon Shield -NSP--Update 1.3.2-.rar
While the base 1.3.0 update added the first half of the Expansion Pass (Isle of Armor), version 1.3.2 was the requisite patch for the second half: The game itself
To install or update Pokémon Shield NSP to version 1.3.2: the Ghost-type Gym Leader Allister