Nintendo Sues the Company Behind Palworld
https://youtu.be/py8hNkc1NlQ?si=SQ-ECI-JRUgFvk8H
For patent infringement, not for copyright infringement. Not sure what patents Nintendo says Palworld violated; might be one covering the act of throwing a ball-like object to capture monsters.
The case is filed under Japanese patent law, which I'm even less familiar with than US patent law. I suspect Nintendo is overreaching just to be jerks but who knows?