
The rate at which this happens is 1 in 1365.3 in Generation 5 - and is even lower in Gen 6 and possibly in Gen 7 but no concrete number is known. You have them breed until a Shiny Pokémon is hatched. So your Squirtle from Japan and your Tyrunt from North America - just as an example. How the Masuda Method works is you’ll have to breed two Pokémon who originate from different regions of the world. Introduced in Generation 4, the Masuda Method allows trainers to breed a shiny Pokémon with the stats, moves and abilities they want instead of searching the wilds for one. This technique was named after the Pokémon developer Junichi Masuda who was the first to reveal this method. In Ultra Sun and Moon, Legendary Pokémon aren’t shiny locked so when you are about to encounter them in the Ultra Wormhole (see below) save and soft reset until you get a Shiny Legendary. Simply by pressing L + R + SELECT you’ll reset the game to your last save. There’s a very slim chance to obtaining a Shiny Pokémon in these scenarios so if you don’t get a Shiny Starter or Legendary, you’ll need to soft reset. This is namely when you choose your Starter Pokémon and encountering a Legendary Pokémon. There are certain parts of Pokémon Ultra Sun and Ultra Moon that an encounter will be determined. This is a slightly better chance than the 1 in 8192 it used to be.

The odds to finding a Shiny Pokémon this way is 1 in 4096 from Pokémon X and Y onward. However, this is completely random and the odds of you encountering a Shiny Pokémon is very low. Just by exploring and walking through grass, water and caves you have a chance to encounter a Shiny Pokémon. The most tried and true method to finding Shiny Pokémon.
