If you were wondering how to get Marshadow, Volcanion and Genesect in Pokémon Sword and Pokémon Shield, The Pokémon Company is running a special Phantom Pokemon Get Challenge distribution event that will solve.
This event started in Japan on 20th November 2020 and runs until 30th April 2021, rewarding those that buy Pokémon-related products from participating convenience stores with codes that can be redeemed to earn points.
Once you have earned 30 points you will be able to receive serial codes to unlock the three Mythical Pokémon in Pokémon Sword and Pokémon Shield.
Given the global COVID-19 pandemic making this more problematic for players to achieve, YouTubers have stepped in to provide a walkthrough on how you can add the Mythical Pokémon to your Pokédex. You can see one such video below!
Pokémon Sword and Pokémon Shield are now available exclusively for Nintendo Switch worldwide.