A question just popped into my head, on R/S/E if you bump into a lati@s in the wild (not the southern island one) and it's shiny but it flees, will it still be shiny when you find it again? This hasn't actually happened to me but I wanted to know.
or you could save infront of the TV after the E4 and then go hunting if its not shiny then soft reset. but this was is far too hard compared to the southern Islands (thats how I got my Latis)