The Pokémon Information Bureau's official Japanese Twitter account announced two codes for Pokémon Scarlet and Pokémon Violet for Valentines Day. They were unlocked when the Likes for the tweet reached the 20,000 and 140,000 plateaus. The codes can be used from February 14th, 2023 until March 14th, 2023 at 23:59 JST.

Codes:

Destiny Knot: HAPPYVALENT1NE
Love Balls: L0VEL0VEL0VE

Source: https://twitter.com/poke_times/status/1625298784195338247