What is the RNG manipulation method in FRLG? And how do I do it?

Question

Now I know this question has been asked before in a different context, but I am asking for FRLG specifically AND I ask for an explanation of shiny frames also tell me a guide on how to do this method as the other question didnt really help with that

Also please do not use imgur, in the uk, imgur does not work. instead of a photo, I get a blue/pink screen that says “Content not viewable in your region”. this is part of the reason I want a new answer, as I cannot see the photos they reference to often (in the answer I linked to) to explain this

Comments

Thank you for putting that out there, I have been staring at those content not viewable boxes too much

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Yeah, what makes me really annoyed is when it’s like “I can’t be bothered to write something so I’m gonna show you a pic that explains everything (content not veiwable in your region) and now you should know everything, hope I helped!” I’ve seen at least 10 of these