I'm back with an update!
Electrike: 5 eggs, 1 shiny (#4)
Onix: 1430 eggs, 2 shinies (#1424 | #1427)
Magnemite: 330 eggs, no shiny
Absol: 370 eggs, no shiny
Total: 2135 eggs, 3 shinies
So after I got that Electrike right away last time, my next target was Onix. I put in 800 eggs, nothing, I gave...