Although Shiny Pokémon are very rare encounters in Pokémon Sun and Moon and the past titles, there are ways to increase your chances of getting one. Of course, you can just wait for it to happen, which may not happen at all throughout the game or do everything you can to get your hands on one. That is if you really want one or more.
Pokémon Sun And Moon Ally Calling Chain
This is the only method that has been confirmed to be working so far in Pokémon Sun and Moon. According to user Sprongz of Reddit, almost every wild Pokémon can call an ally for help "at the end of the turn." Although this happens randomly, a player can use an item to force ally calling.
You will need to buy an Adrenaline Orb, which is already available early in the game. Use this to have the Pokémon you are battling in Pokémon Sun and Moon call for another creature, which is usually of the same species. KO one and have the other call for help.
You might have already guessed why this is a chain. The trick is to get Pokémon call an ally again and again until you encounter a Shiny Pokémon.
"Wild pokemon -> adrenaline orb -> call for help -> KO one of the two mons, doesn't matter -> call for help -> KO mon -> call for help -> KO mon" and so on, Sprongz noted.
Other notes to consider: the Orb can only be used once. However, if it fails and the monster does not call for an ally, your turn will only be used up so you can use the item again. Also, note that the longer the chain, the higher your chances of getting a Shiny Pokémon so be prepared for a long battle.
The Junichi Masuda Technique
This method was obviously named after the Pokémon developer. This also requires some patience, but it might be better than waiting around to encounter a Shiny in Pokémon Sun and Moon.
According to iDigitalTimes, this will ensure that you have a Shiny Pokémon with the stats and abilities that you want if done successfully. The method is quite straightforward. All you have to do is have to creatures from different sides of the world breed until you get what you are looking for. Don't worry, this is not some kind of Pokémon abuse.
Even using this method, the chance of having a Shiny is still extremely low. You get 1 in 1,365.3 chance of being successful in Generation 5. It is lower in Generation 6. It is currently unknown what the rate is in Generation 7, but it is presumed to be even lower.
You can try this out to see if it works, but there are no recorded instances yet of having a Shiny this way in Pokémon Sun and Moon. If you really want one, though, it is definitely worth a try. Meanwhile, check out our tips on how to get a Shiny Pokémon as your starter.