It’s a patent lawsuit which might have a better chance than a copyright lawsuit but Nintendo didn’t disclose which patent(s) and Pocketpair also doesn’t know yet either.
You’re right though that any patent Pocketpair is infringing upon would also have likely been infringed by dozens of other games. Nintendo is just upset Pocketpair made millions with a game that appealed to Pokemon fans and want to ensure nobody else does it again.
Pocketpair also doesn’t know yet either.
They have the full wording of the lawsuit. I’m sure they know.
You can’t just sue somebody on “trust me, bro”.
I mean…you can. All lawsuits start with an application at a courthouse and that application can say whatever the plaintiff wants.
Here’s youtube lawyer LegalEagle reviewing some crazy ones. Like a man who sued David Copperfield for stealing magical powers granted to him by God. Lawsuits can say literally anything in their initial application.