The Pokémon Company has announced a code for a 7-Day Limited License for Sylveon in Pokémon UNITE! Jump into the arena as this ranged attacker to scorch, smooch, and stare down opponents. The code is: EEVEE0700 and is active from June 14th, 2023 until June 30th, 2023.

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/PokemonNewsUK/status/1668966530904727556