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News Release : Sep. 19, 2024 "Filing Lawsuit for Infringement of Patent Rights against Pocketpair, Inc."
https://www.nintendo.co.jp/corporate/release/en/2024/240919.html
Press release of Nintendo Co., Ltd.
https://www.nintendo.co.jp/corporate/release/en/2024/240919.html
Press release of Nintendo Co., Ltd.
World of Final Fantasy is as close to a Pokemon rip off as you can get, and they didn't get sued.
Edit. And now I think about it, the mobile game of Rick and Morty was very much a reskin of Pokemon.