>>22639561>what search lvl would b needed?Research suggests that there is no single optimal level range like how it was for Pokeradar in DPPt and XY. As long as you're in the act of chaining, the rate of encountering a shiny goes up.
>Is masuda metthod better ?Masuda Method is always better if you want to secure a better chance of outstanding IVs, influence the inherited ability, and guarantee a particular nature and egg moves on your offspring. But it's generally the slowest path. If you just want a pretty trophy to look at, then Dexnav chain it. If you want to use it in battle, breed it.
Dexnav chaining is hell in water or in a cave, so if you have Y version, I actually suggest fish chaining it instead. Suction Cups will increase the chance of a bite, but rather than that, cast out so that your bobber is surrounded by rocks, as that will increase your fishing encounter chance as well, and it will allow you to use your first slot for a Synchronizer, which gives you a chance of controlling a wild encounter's nature.