How do you redeem Pokemon serial code?

To redeem a Pokémon serial code, first, launch your Pokémon game on the Nintendo Switch or Nintendo 3DS. Navigate to the in-game menu, look for the option that allows you to enter a code (often found in the Mystery Gift section), and select it. Enter the serial code as prompted, and confirm your entry to receive the associated gift. After successfully redeeming, the gift will typically be available in your in-game mailbox or at a designated location.