My first one was a Shiny Whirlpede in B2, it appeared on top of the waterfall in Lostlorn Forest in a double encounter. I knocked out the other one and gently whittled its HP down and caught it. Next one was a Shiny Metang in W2 in the Giant Chasm, also a double battle, caught it and evolved it into a beautiful white and gold Metagross, who now resides in Y at level 100. And again in B2, a random shiny Sunkern. They were my first three random encountered Shinies, all of whom now reside in my X and Y games, I was afraid I'd lose my B2 and W2 files since I had read about it happening to others, so I rescued them via the Poke Transporter and Poke Bank for my X and Y games. After them I caught many a Shiny in my XYORAS games, mostly from the safaris, chain fishing, and horde battles. I have yet to find me a seventh gen Alolan shiny, I am working on my Sun Pokedexes to get my charm before the Poke Bank comes out this month. I am trying to evolve my Type Null and Riolu, both of them are damnable friendship evolvers...they do no like me enough to evolve.