The possible reasons are many. Firstly, the fanfic might not be in line with the official Pokémon storyline that Ash is accustomed to. His character development and relationship with Misty are important aspects in the official story. If the fanfic distorts these elements, he would reject it. Secondly, the writing style of the fanfic could be off - putting. If it's too convoluted or hard to understand, Ash (as a character in this context) would not be interested. Thirdly, if the fanfic focuses too much on a romantic aspect between Ash and Misty in a way that Ash doesn't feel comfortable with, given his more friendship - and - adventure - oriented personality in the official story, he would reject it.
One reason could be that the fanfic has a strange or unappealing plot. For example, if it makes Ash do something completely out of his character, like being mean to Misty for no good reason.
Maybe the fanfic contains inaccuracies about the Pokémon world that Ash is a part of. If it misrepresents the relationship between him and Misty in a way that he doesn't like, he would reject it. Also, if the fanfic has a very dark or inappropriate tone that doesn't fit with Ash's positive and adventurous image, he would not be on board with it.
A practical answer is Chapter 105, because it turns the idea into a concrete scene. The chapter opens with But this did not elicit any sympathy from the woman on the phone;
If you want the clearest chapter reference, go to Chapter 127. Early on, Witnessing Jiang Li leave with a bucket, Jiang Yan refused to admit...; later, the chapter leans on Otherwise, how would he ever show his face in the Capital again?"....
Chapter 157 is the strongest chapter-level answer because it starts from It was already the last day of Flash Change in his dream. and follows through on I'm laughing myself crazy, do actors all have such strong conviction?]....
A practical answer is Chapter 143, because it turns the idea into a concrete scene. The chapter opens with Is there really such delicious fish soup in the world?, adds pressure through If you're still single, how about I set you up with someone?, and ends on The live stream audience couldn't help.
Chapter 122 is the strongest chapter-level answer because it starts from Damn, are we supposed to find the points card in the mud?!" He had just... and follows through on He had just steadied himself when Qi Tianyu, frantically searching for....
The best chapter pointer here is Chapter 114, "I've never seen someone so shameless!". It opens with As time passed, the number of viewers in the live broadcast gradually... and closes on But just now, an uncle came and said not to give you anything to eat." Qi....
Chapter 149 is the strongest chapter-level answer because it starts from Seeing that Zhang Cheng's glass was nearly empty, Du Qinglian immediately... and follows through on Zhang, I introduced myself at the very beginning..
If you want the clearest chapter reference, go to Chapter 124. Early on, Since there were too many points cards inside Jiang Li's barrel, Director...; later, the chapter leans on However, Jiang Li merely lifted her eyelids and said indifferently, "No....
A practical answer is Chapter 93, because it turns the idea into a concrete scene. The chapter opens with Jiang Li looked back and saw several aunties linking arms, walking up the..., adds pressure through Even if they were hiring actors, could they really come up with such an..., and ends on I.
A practical answer is Chapter 137, because it turns the idea into a concrete scene. The chapter opens with Jiang Li personally went to Lai Fu's tomb and performed a small ritual., adds pressure through You help me with this, and I can share some with you;