An early prototype ROM of what would eventually become Pokemon Gold/Silver was leaked onto the Internet today. This ResetEra thread contains a write-up by user ERAsaur, who worked with The Cutting Room Floor to examine the prototype and list out all the unreleased content found in the ROM:
https://www.resetera.com/threads/...
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My son... gives me Helpful Nintendo Hints that are far too complex for the adult mind to comprehend. Here's a verbatim example: "OK, there's Ganon and miniature Ganon and there's these things like jelly beans and the miniature Ganon is more powerfuller, because when you touch him the flying eagles come down and the octopus shoots red rocks and the swamp takes longer." And the hell of it is, I know he's right. - Dave Barry