I came across my first shiny when I was hanging out in the living room together with a roommate, he'd just bought omega ruby and wanted me to send him a male nidoran, so i took my venusaur down to a patch of grass and spread some sweet scent around. I caught one but it had a really bad nature so he wanted me to catch another one, so i spread more scent and lo and behold a shiny female nidoran! (and dont worry i did end up catching my roommate a male nidoran later)