Dexnav shiny chances?

What are the actual numbers for acquiring a shiny through the dexnav chain method? I have scoured the internet and the closest thing that I have found was this.

The chance of encountering a Shiny Pokémon also increases, estimatedto reach 0.5% per encounter after 40 chained encounters, and remain atthat rate as long as the chain continues. There is thus a 50% chanceof encountering a Shiny Pokémon in the first (roughly) 130 chainedencounters. A chain is broken when the player leaves the area(including entering a building), encounters a wild Pokémon that isn’thidden, or moves too quickly and scares away a hidden Pokémon. HiddenPokémon can be encountered for a chain either with or without theSearch function. Getting the message “The Pokémon couldn’t be found.Try looking in a different area!” when using the Search function doesnot break the chain.

I am confident that I am doing the chain correctly but have been unsuccessful after making several chains that go well over 200. Any assistance would be greatly appreciated.

Pleaselog inorregisterto add a comment.

Those appear to be the actual numbers. Also, it did say> There is thus a 50% chance of encountering a Shiny Pokémon in the first(roughly)130 chained encounters.

“Roughly” means that the 50% mark lies around that point, mathematically. It could be anywhere as low as 120, or as high as 160. The fact that you still haven’t found a Shiny is just a roll of the dice – no matter how favourable your odds are, there is still a chance of failure. Just keep chaining, and you’ll get that Shiny. I commend you on having the patience to chain 200+ Pokémon, I was chaining fora Bold HA Tangela and only found two in 60, and neither was Bold. So I gave up and decided to breed for it.