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...
Copyright of code doesn't work that way. Now if some idiot goes and uses that code in a game, yeah, they'd have a rough time in court.
If Nintendo thought there was infringement already, and wanted to prove it in court, there are means to securely prove it with redactions and NDA's and so forth as it would be considered trade secret.
They literally never introduce any new concepts to their games I think the last new innovation in the pokemon game is supposed to allow you to have two vs two. That was about 10 years ago I think
I like to shit on Pokemon and Nintendo as much as the rest of them but this isn't really true. Legends: Arceus, while not a great pokemon game overall, introduced several new mechanics, some of which then made their way into Scarlet/Violet. The biggest and best of which, in my opinion, is the ability to catch wild pokemon without battling them.
You have always been able to throw a ball at an unharmed Pokémon to capture it. Just had a very low chance of success unless it was either very low level or it was a great ball or one of the other ones they introduced later. But even back in red and blue you could always try it and it might work.