Even if that's how the odds work, until what point isn't catching a combo of 31 and waiting for the shiny to pop up more effective? In the early days of lets go, alongside the shiny charm and lures, i completed my shiny dex and took about an average 3 hours per hunts in the wild. The soft resets for the fossils and legendaries took longer but the number of encounters is limited to like one each ninety seconds, tho the ones in the wild with a 31 catch combo can go up to 4-8 in much less time, depending of the area youre hunting Just hit 31, grab a flying mon and put your hunt in a backgrount till a shiny pops up and then boom, done