Online Competitions have begun in Pokémon Sword and Pokémon Shield on Nintendo Switch, with some minor changes to how they operate. As a result, you'll need to link your Nintendo Account to your Pokémon Trainer Club account to earn Championship Points (CP) in Online Competitions that award them. You don't need to link your accounts to register for and compete in these competitions, but you won't be eligible to earn CP if you don't link them.
The upcoming 2020 International Challenge February is the first of these competitions. Registration begins February 19, 2020. If you want to earn CP in this competition, you'll need to link your accounts before registering for the competition and keep them linked until after CP have been awarded. If you unlink your accounts in the future, you'll retain any CP you've earned.
Children will need to have the parent or guardian who manages their account log in to their Pokémon Trainer Club account and consent to linking the accounts before continuing.
Follow these steps to link your accounts.
Log in to your Pokémon Trainer Club account.
Click Nintendo Account Link in the sidebar.
Read the information on linking your accounts.
If you agree, click the Link to Nintendo Account button, which will send you to a Nintendo.com log-in page.
Log in to your Nintendo Account—be sure your birth date matches on both accounts! Accept the request of Date of Birth permissions.
You're all set! You'll be returned to Pokemon.com.
If you have any issues or concerns with linking your accounts, please contact Pokémon Support.