The guy in the video wasn’t that lucky, he seemed to have kept 2 egg from 2 different event, the maril one was a research day and had increased luck in egg, and same for the riolu thats why it was in a 2k egg instead of a 10k
So lucky! Just wanna share, It was actully happened to me thrice, first is Shiny Smoochum and Shiny Wynaut, Second is Shiny Pichu (Cherry Blossom) and Shiny Bonsly and last is Chingling and Shiny Munchlax.
A few months ago I hatched a Shiny Pachurisu, then like a week later the game decided that one Shiny from an Egg was enough, it decided to give me a Shiny Riolu as well
Bro cut the vids together while there was the hatch days cause you can't get shiny riolu from 2km egg and idk about the azurill but it had a hatch day right before the riolu one
Shiny’s are just a little bit harder and if you if you have a shiny pokemon like shiny charmander as your buddy is will make it charmanders will have a tiny bit higher rate to spawn and a tiny higher chance to be a shiny
The Only Shines I Ever Hatched Are A Shiny Tyrogue That I Evolved Into A Hitmonlee, A Shiny Pawniard Now A A Shiny Bisharp, And Lastly A Shiny Klink Now A Shiny Klang