First shiny I ever had was a Yanma back in Silver.
First shiny I ever got when I realized how special they were was... a Kricketune. Talk about a golden turd.
I also got a Psyduck in D/P, so that was fun. Then nothing in B/W, then an Alomamola when going for a Clauncher. Nothing in Sw/Sh or Scarlet yet.