The serial codes to redeem this Pokémon were distributed to players in different locations, to celebrate the 2023 Pokémon World Championships.
Format Ver.3.0.1-5, Post Updated Date:20230808_1400
What can be done with these files
PKM creation with PKHeX (drag & drop the wondercard file in the spot where you want the Pokémon)
In-Game Mystery Gift redemption with Switch Gift Data Manager