I'm not sure specifically which one is the absolute longest Pokémon Lemon fanfiction. Fanfiction lengths can vary greatly and new ones are constantly being created. Also, 'Lemon' fanfictions often contain inappropriate or adult - themed content which is not in line with the family - friendly nature of Pokémon.
Finding the longest Pokémon Lemon fanfiction is a difficult task. There are numerous fanfiction platforms out there, and many of them have rules against such explicit content. Moreover, the concept of length can be subjective depending on how it's measured, whether by word count, page count, or chapter count.
Chapter 247, "Madam, Your 2000 Kilograms of Sweet Potatoes, Please Check and Accept", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event.
Chapter 468, "Joyously Receiving a Fainting Gift Pack", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. It opens with Seeing a human, the wild boar became even more agitated, a massive...
Chapter 251, "It seems that going on a transformation show is really useful!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event.
Chapter 358, "That dress of hers must be a fake!", is the clearest early answer because it turns Shu Yan's situation into a concrete plot event. The chapter gives readers a real answer by opening on I just drove here slowly." In an instant, all cameras swiveled in his...
Chapter 185, "We Are the Real Team", is the clearest early answer because it turns President Shang's situation into a concrete plot event. The chapter gives readers a real answer by opening on He was so anxious that he immediately picked up the megaphone.
Chapter 580, "Old Sir Gu: I command you to start a live stream!", is the clearest early answer because it turns Team's situation into a concrete plot event. The chapter turns that into something concrete by moving from After seeing those comments, Ai Xiaochun was overjoyed.
Chapter 402, "The Survival Game Officially Begins!", is the clearest early answer because it turns Jiang Shixu's situation into a concrete plot event. The chapter turns that into something concrete by moving from What kind of face was it?
Chapter 142, "From Enemy to Best Friend?!", is the clearest early answer because it turns Is Jiang Li's situation into a concrete plot event. The chapter gives readers a real answer by opening on The ingredients for making Buddha Jumps Over the Wall were still on...
Chapter 404, "The Vice Dean of Hua Country Chinese Medicine University?!", is the clearest early answer because the rescue effort creates visible on-page results. Early on, Several minutes later, Jiang Li doubled back and knocked on Huo.... By the end, So you're just an internet celebrity..
Chapter 312, "Charity Gala Invitation", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event.