It's unfortunate how much we don't know about these games
Pokemon is a huge inspiration for so many people. Maybe it was their first exposure to anime, maybe ROM hacking was their gateway into game development, and every once in a while, you see a person crediting Pokemon Crystal for their chosen career in zoology. I love how many lives this series touches which makes it odd how much of a black box it is.
So much of what we know about the design process for these games is tangled up in old interviews, deleted tweets, or was obtained by illicit means.
I practically have a punch card for every time a Did You Know Gaming Video includes the line 'this heap of new information comes from a Japanese interview from 2006'. If not translated, there's also all the lost info. One of the former head writer's of the series posted a tweet of the official game timeline before taking it down and James Turner, art director for SwSh, took down every post about behind the scenes at GameFreak. Takeshi Shudō, the former writer for the anime famously spoke very candidly about his writing process and intended series ending which I think he only got away with because his bosses weren't looking and they don't want to bury the words of the dead now.
The most insight we've gotten about the inner workings of the franchise was the tera leak a few years ago. It was so cool to see all of the concepting of games going back to the GBA days, but it came at the cost of the personal info of a lot of GameFreak devs which sucks.
I know when you produce childhood whimsy at the industrial scale the way Pokemon does, it's not incentivized to pull back the curtain and show how the magic happens, but I wish they did. I would love for a full director's commentary of the entire Pokedex from the art team, I'd love to hear about the mind-boggling task of coding for all of the interactions that happen in battles, I just want to know all of it!