Source: iMore
The Crown Tundra is now available in the Pokémon Sword and Shield Expansion Pass, giving players access to a new map populated by more than 100 additional Pokémon. If you want to catch the super rare shiny versions of Kyogre, Lugia, and others, your best bet is to get the Shiny Charm. Here's how to get the item and increase your chance of catching shiny Pokémon.
How to get the Shiny Charm in Pokémon Sword and Shield
There are a few steps that you'll need to complete in order to get the Shiny Charm. Here they are.
Complete the Pokédex
Source: iMore
The Shiny Charm is a reward that's given to you after you've completed the Galar region Pokédex. That means you'll need to have caught and registered all 400 Pokémon from the Sword and Shield games. This is a challenging feat as some Pokémon are exclusive to Sword, and others are exclusive to Shield.
You'll need to trade Pokémon with players that own the opposite version if you hope to catch them all. If a Pokémon is available in your game but you're having a rough time finding it, check the specific Pokédex entry for that Pokémon and then view it's habitat. You'll be able to see the location and weather conditions that the Pokémon spawns in. Just note that some Pokémon must be given to you by an NPC and don't spawn anywhere in Galar.
Talk to the man at the Circhester hotel
Source: iMore
Once you've completed the Pokédex, travel to Circhester. Take a right immediately upon entering the city, and you'll see a building with several flags hanging from it. This is the Hotel Ionia. Enter the building and take the elevator up a floor.
Now head to the room on the far left of the building. Inside you'll find a few different people. Head to the back and talk to the man dressed like a tired doctor. You might recognize him as the man who gave you the Catching Charm earlier in the game. Upon verifying that you've completed the Pokédex, he'll hand over the Shiny Charm.
Once this is done, your chances of seeing a shiny go up from 1/4096 to 1/1365.33. That increases the odds quite a bit!
Increased shiny rate in the Max Lair
Source: iMore
If you've purchased the Expansion Pass, then you will be able to travel to the Crown Tundra. There, you'll find a Max Lair that hosts the Dynamax Adventures where you'll battle several Dynamax Pokémon in a row before coming across a Dynamax Legendary. According to @SciresM on Twitter, if you have the Shiny Charm on you, your chances of encountering a Shiny Pokémon in the Max Lair are 1/100, which is really high! That alone makes it worthwhile to pick up the Shiny Charm.
Catch all the shinies with the Shiny Charm in Pokémon Sword and Shield!
Once you've caught all of the Pokémon in the Galar region and completed the Pokédex, you'll be able to go to the hotel in Circhester and receive the Shiny Charm in Pokémon Sword and Shield. This also gives you a certificate stating that you've caught every Pokémon in the Galar region Pokédex. You might want to screenshot that baby and post it on your social media accounts. Good luck shiny hunting! I hope you can find everything you're looking for.

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