Me again.
I downloaded the leaked platinum source code and this particular weather effect is called "KOGOREBI".
It's assigned to Eterna Forest, and the inside areas of Full Moon and New Moon Island.
I've posted the relevant source code on pastebin.
https://pastebin.com/2cFcUFQ4So I did some digging on "kogorebi", and found something interesting:
https://evs-translations.com/blog/komorebi/>Komorebi is an untranslatable word, which eloquently captures the effect of sunlight streaming through the leaves of the trees.>the effect of sunlight streaming through the leaves of treesThis is one letter off, but I suspect it's simply a transliteration issue. Turns out this is more common than you might think:
https://japanese.stackexchange.com/questions/4708/why-does-the-g-tends-to-sound-more-like-a-m-or-nThe "FOG" in the code likely refers to it using the same layer as a fog effect would.
