Players of Pokémon UNITE can receive a Sprigatito Boost Emblem from December 7th, 2023 to January 6th, 2024 at 15:59 JST by using the code: GETSPRIGATITO.

Pokémon UNITE Code Redemption Instructions

To redeem:

1. In Pokémon UNITE, go to the events screen, select Daily Events, and select Gift Exchange from the list on the left.
2. Select the Exchange button.
3. On the Gift Exchange screen, enter your gift code.
4. Up to 48 hours after successfully entering your gift code, you'll receive in-game mail containing the item!

Only one gift code can be redeemed per Pokémon UNITE account. Gifts expire 30 days after they appear in your mail, so please claim them as soon as possible. Please note that expired gift codes cannot be redeemed.

Source: https://twitter.com/poke_unite_jp/status/1732656189291352115