I bought 10,000 leppa berries, and I went to Mt. Silver to hunt a larvitar shiny, after +180,000 encounters I got an onix which I evolved into steelix.
After evolving my horsea to seadra, I went hunting for a shiny golduck, which came out 18 minutes after my rapidash, giving me a total of 3 shinies in 24 minutes, which I consider a Guinness World Record.
After sharing the link of my horsea in the global chat and in the team chat, I went to level it up on route 12 of Unova and in the first horde of rapidash a shiny appears, 6 minutes after my horsea.