What is the lowest theoretically possible shiny chance in any game?

Question

considering glitches, I believe I heard it gets below 1/16000 in some situations in early gens but I don't recall where I heard that.

thx frog for making me curious

Comments

In Generation 4, if none of the values forced by Cute Charm force a shiny, then the shiny odds with it equipped are 1/24576. This is because a shiny is only possible if Cute Charm fails.
I don't know if the odds get any lower than this beyond unintentional shiny locks, such as wild encounters in Gen I

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hey, now I'M curious. +1

Also I love how I jokingly asked not to be called "froggy" on my "about me" one time, which I figure nobody ever reads, and all of a sudden nobody ever called me froggy again, and they did call me what I recommended: "frog" and "fraug". Frog IS still way better though.

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All of the unown forms have different shiny odds in gen3 due to them being attached to personality value back then. This means that wich forms have wich odds changes per save file. The chance per form can either be higher or lower than normal but I can't find the exact odds

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It might be possible to get a lower shiny chance by breeding in gen 2.