Nintendo’s Palworld lawsuit may be in trouble after Japan rejects Pokemon creature-capture patent

Nintendo's intellectual property defense against Palworld developer Pocketpair has encountered a setback as the Japan Patent Office (JPO) rejected one of Nintendo's key creature-capture system patents (application no. 2024-031879) in late October 2025, citing a lack of originality due to prior art. While this administrative ruling does not automatically invalidate Nintendo's ongoing lawsuit in the Tokyo District Court, analysts suggest it could significantly influence the court's assessment of originality for other related patents central to the infringement claims, potentially increasing scrutiny on Nintendo's broader IP portfolio and extending the legal proceedings into 2026.

Analysis

Nintendo's intellectual property defense against Pocketpair's Palworld has encountered a significant setback as the Japan Patent Office (JPO) rejected patent application no. 2024-031879 in late October 2025. The JPO cited a lack of originality, referencing multiple prior games like Monster Hunter 4 and Pokemon GO that utilized similar creature-capture mechanics. This administrative decision, while not directly invalidating Nintendo's ongoing Tokyo District Court lawsuit, introduces considerable uncertainty into the legal proceedings.

The rejected patent is part of a broader family, including JP 7493117, JP 7545191, and JP 7528390, which are central to Nintendo's infringement claims regarding creature capture and rideable creature switching. Analyst Florian Mueller suggests this rejection could act as a "key building block" being removed, potentially increasing scrutiny on the originality of other patents asserted in court. Nintendo has until late December 2025 to appeal or amend the decision.

While the Tokyo District Court is not bound by the JPO's administrative ruling, the decision may influence the court's evaluation of Nintendo's claimed systems' originality, a point Pocketpair is expected to contest. This development, coupled with previous delays from Nintendo amending another disputed patent, is expected to prolong legal proceedings well into 2026. The moderately negative sentiment and uncertain tone reflect the increased legal risk for Nintendo's IP strategy.

Key Decisions for Investors

• Investors should closely monitor Nintendo's appeal or amendment of the rejected patent and subsequent court proceedings, as the JPO's ruling introduces increased legal risk to their IP defense strategy.
• Re-evaluate the strength and defensibility of Nintendo's intellectual property, particularly concerning core game mechanics, given the JPO's finding of non-originality for a related patent.
• Factor in the extended litigation timeline, now expected to continue into 2026, which could incur additional legal costs and ongoing uncertainty for Nintendo.