This Pikachu was distributed through serial codes in Pokémon Centers in Japan to celebrate the 25th anniversary of the stores.
The Pokémon was guaranteed to have either 0 or 255 as Scale value, making it eligible to obtain the Mini Mark or the Jumbo Mark. (It does not come automatically with the Mini/Jumbo mark. You’ll still have to talk to the NPC in Mesagoza that awards them)
Format Ver.3.0.1-5, Post Updated Date:20230421_2236
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