The Japanese patent system is so, so much worse than the US one. Where things like what you just described are possible. Honestly, Palworld is probably hosed over there. Palworld made a system years ago, Nintendo then patented it, and Nintendo is going to beat them over the head with their Japanese patent.
In the US, a solid defense to a patent claim is to show prior art. In this case, Palworld’s dev can point to Palworld as the prior art if Nintendo sues them; Nintendo’s patent existed after Palworld did. Palworld’s dev can also point to a giant mountain of prior art of other games that allow one to throw an object to capture a monster.
The Japanese patent system is so, so much worse than the US one. Where things like what you just described are possible. Honestly, Palworld is probably hosed over there. Palworld made a system years ago, Nintendo then patented it, and Nintendo is going to beat them over the head with their Japanese patent.
In the US, a solid defense to a patent claim is to show prior art. In this case, Palworld’s dev can point to Palworld as the prior art if Nintendo sues them; Nintendo’s patent existed after Palworld did. Palworld’s dev can also point to a giant mountain of prior art of other games that allow one to throw an object to capture a monster.
Like throwing a net to catch a fish?