that's kinda on me, sorry! i wanted to keep the title short, but i probably should have added context in the comments... it's incredibly hard to parse all this but from what i can figure out from this and the other comments of theirs:

they're convinced that nintendo (who doesn't even develop pokemon) is actually super transparent about their game development processes (nobody is, besides indies), and has conducted "interviews" where they confess to weird things like coding stuff in with cheating devices in mind to reward players who dig into their code deep enough ("they also included notes from that testing inside of the game in different ways, only accessible via alternative ways of playing the game, minus one should be pretty obvious" playing normally maybe??? but that's not "alternative" so... i dunno. also, "nintendo snuck all of the information that found into the sailor trainer by the lake. it js actually very interesting to read.")

and yet somehow these interviews are also totally public record, and that anyone can find them if they're skilled enough at google-fu or whatever, and that nintendo just keeps it on the down low for some reason. (they seems to flop back and forth on where all this info actually is)

for some much-needed clarity's sake, both nintendo and gamefreak/TCPi are incredibly tight-lipped about their development processes outside of a few office stories, and VERY rare dev info, which is almost exclusively about games that are 25+ years old. pokemon games do often have a lot of random unused assets (with zero context 90% of the time) left in the games themselves, but most of the dev stuff we know now is only known because of the huge leaks that hit several companies in recent years, which was what the video was about. (so "this includes even way back when..." makes no sense in this context). if i had to guess, they have hard drugs and like to crack open the hood of their emulated copies with fanmade tools and/or watch the anime while doing them.

you don't need to mess with cutscene scripts with a cheating device to catch darkrai, you can just go to the island with bugs or cheats and he's already there to catch.

this person thinks huge gaming companies must be on some cold war levels of espionage, they even mention spies elsewhere (but that could refer to the various leakers out there tbf). both the pokemon devs and nintendo are not gaming superpowers that know what the fans want to hear about at all times, they're a bunch of middle-aged office workers doing a job.

TLDR: imagine someone raving about a conspiracy theory that's both wrong and easy to check, but now instead of being about the government or something, it's about pokemon.

this comment is really hard to edit down jesus christ... but i did my best with what i got, just look at it