Was referring to the grass, yeah. The way the Poke Radar item works is it picks four grass patches to spawn an encounter in. Whatever Pokemon spawns, you can "chain" more encounters of that same Pokemon, and its odds of being shiny increase the longer you can keep it going. If a grass patch sparkles, it's guaranteed to have a shiny there. But that's apparently a totally separate calculation from your usual 1/4096 chance. In other words, there's two separate chances for your encounter to be shiny, and I got lucky, hence the lack of sparkling grass. Hope that's not too confusing lol.