Hi, I've completed 99.9% of the quest,
but when I go back to Rowan/Dawn after retrieving the data, Dawn tells me I don't have enough Sinnoh experience,
even though I meet all the prerequisites (see images).
Does anyone have any idea why? Did I miss something?

 

You are missing 15 non-legend caught datas of gen4 poke, just like it stated.

Edited December 10, 2025Dec 10 by Mingrenpro

But i have caught datas of the first 563 pokemon, the first data i don't have is 564 (tirtouga) 
If I'm missing some data, how do I know which ones?

Check again from 387-479, there should be 15 of them missing the pokeball symbol, which are those you're lacking 

Edited December 10, 2025Dec 10 by Mingrenpro

Ok when i play i check this, thanks for help

Aside from legendary ones, I only have 2 that haven't been captured.

while he told me that 13 are missing

You should be able to proceed further already right?

Good day @Yukihoro

 

 

Apologies for the delay, it appears that @Mingrenpro has successfully addressed your issues and according to our database, you have completed the Lake Trio Quest. Well done!

 

With that being said, I will be closing this thread now. If you have further questions or concerns, do not hesitate to reach out.

 

Regards,

Bitterblade