Shinies from gen6 onwards have odds halved from 1:8192 → 1:4096
However this dœsn't mean shinies suddenly trivial to find . Haven't recalled moments where found shinies unless actively lꚙKing for them till gen 9 where random encounters replaced with overworld
Also possible the ROM hack your playing might've increased odds but they've not advertised it
(Moth|serval)s !