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...
They can’t use this code at all, it would be a surefire way to get the project shut down. Reverse engineering is the only way to operate something like that legally.
They can see how it’s done and code their own thing. They don’t have to cut and paste the code, just know how its done.