I got the shiny charm for a while so I help I hatch 600 and update every 100 eggs.
JPN treecko female ENG treecko male(both have 5 ivs)
Batch 1 (1-100) : no shiny
Batch 2 (101-200) : no shiny
Batch 3 (201-300) : no shiny
Batch 4 (301-400): in progress