Apply the latest version update .nsp file. This step replaces older code and matches the software version required by the DLC.

The premium Pokkén Tournament DX Battle Pack adds significant variety to combat through two distinct waves of content: Wave 1: Aegislash & New Supports

Provides the core game files, including the initial roster of 21 battle Pokémon such as Decidueye and Shadow Mewtwo.

A powerful, heavy-hitting fighter that controls the arena using long-range water artillery.

Translating to "update" (更新), these files apply critical software patches. These patches correct software bugs, adjust character balance, and are strictly required if you want to use the console's local wireless or internet matchmaking features.

A highly technical fighter capable of switching between Blade Forme (high offense) and Shield Forme (high defense).

If you need help troubleshooting a specific How to Update Pokkén Tournament DX - Nintendo Support