My first Shiny, I wish I still have it. It's what kept me in pokemon actually. I was like, 10, had never played a pokemon game, was playing Fire Red, start a new file, go to the tall grass after getting pokeballs, Shiny Rattata. My very first caught pokemon. While some of you may say it is a waste of a shiny, it made me want to play more.
My first shiny in this sixth gen was a fished Clawitzer, then moments later I chained fish for two others, Clamperl and Huntail, and then after the Huntail, I went back to Santalune forest because I wanted to catch a regular Pikachu for someone, and the very first Pokémon that came up was a shiny Flechtling. All four in under two hours.