To be honest if I only hatched 2 Chanseys in my time playing the game and got the minimum amount of candies from both then had to walk to get the rest of the candies I wouldn't care if another chansey spawned. I had to do that for Mareep, Pupitar, Dratini, Ponyta, Porygon there's tons of Pokemon in Pokemongo that I only ever hatched and had to walk to get the candies to evolved.
I am done with PokemonGo's tracking system failure.
I had 2 Chanseys today despawn before I could find them. The tracker needs to tell you which direction the Pokemon is in. Pokemon moving up or down the tracker doesn't work because 1. If there's only 3 Pokemon on the tracker it's not going to tell you anything. And 2. The first three slots are usually occupied by the Pokemon at the nearest Pokestop which from my house is a half mile away.
It also needs to have a time limit on Pokemon before they despawn. Not all Pokemon that appear on the tracker have 15min spawn time as they likely used up most of their spawn time before they appeared on the tracker. Then you waste time walking to a pokemon a half mile away and it despawns before you get there.
The pokestop tracker isn't terrible but the regular tracker is garbage. To be honest the 3 step system was better then this crap. And now it's cost me 2 Chanseys. Aka the first and second Chansey to ever appear on the tracker since July 2016.