On May 15, 2018, a new software update for Pokkén Tournament DX became available for download. Please take a moment to download and install this update while your Nintendo Switch console is connected to the Internet.
Additional Information:
- This update must be applied in order to use the game’s Internet features.
- Save data will still be available for use after downloading the update.
- If the system is connected to the Internet, the update will download and install automatically.
- Once you have updated the game, you will not be able to play back replay data from a previous version.
Complete These Steps:
- Connect the Nintendo Switch console to the Internet.
- Return to the HOME Menu and launch the game.
- The update will be downloaded and installed automatically.
- Once the update is installed, the newest version number will be displayed on the title screen.
Update Details:
- Version 1.3.1
- This distribution has adjusted the balance of some of the Pokémon added from Ver. 1.2.0 onward.
- Adjustments have been made to make for a more pleasant gaming experience.
Source: Nintendo Support page
Pokémon Blog 
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