First of all this fanfiction is good.
Now somethings that 'I' think could have been better,
1. Mc's emotions, really, he was crying, panicking and distributed when he first arrived at pokemon world, but suddenly he became normal.
Even when talking to Professor Sam, he was not panicking because of what just happened, felt like mc is emotionless when it comes to these dangerous situations, it was his first time being attacked by a high level pokemon (as a normal earth guy).
2. Legendary pokemon fighting was a point where I can see many people leaving, like I know this fiction is good, but if you read futher chapters, then you can ignore that part. I just skipped all that.
3. Now the main thing, everyone not being suspicious is a big problem, like I know prof. Sam doesn't have to be suspicious of mc, but mc not being cautious even after getting knocked out just as they arrived at the camp was really weird part for me in that chapter.
Mc doesn't even know if prof. Sam is good or bad guy in that world, how can he believe him.
4. If rather than just giving the ranks, all that red, puple stats. information in an auxiliary chapter, it should have been better if mc could get it himself, like getting it from pokemon center or someone telling him.
So, basically problem lies in the way mc react or how he knows all that thing about potential and all, other than that its more or less good fiction.
So, that was my opinion and other than that later chaters are getting better.
Oh, and don't take this comment offensively if I ised some words in a wrong way, I was just giving opinion from my side.