It appears another "gigaleak" has gone down, involving Nintendo. According to sources online, it appears that Game Freak has been hacked, resulting in internal data from the company being leaked to the public. Those involved in the hacking community or those within general Pokemon related groups...
You can just follow the guide they made for it.
https://youtu.be/LnGVcYo4uZQ?si=9Hh9uYyJSntkKT2x