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I've SOS chained (with shiny charm) the last three days.
The first day i got shiny Tentacool and Finneon within two hours. I then hunted a Zorua because of the Hisuan reveal, which i got in 2 hours.
The second day i hunted a shiny Psyduck, and got it before even reaching a chain of 30. I then started hunting Cubone, after an hour and a half and a chain of 93 a shiny Kangaskhan appeared, which i caught.
I continued my Cubone hunt today and just finished it, getting it on a chain of 171.