[If you have only played the Nintendo Switch version before]
Nintendo Switch Pokémon UNITE save data will automatically be saved to a linked Nintendo Account.
If you follow the instructions when starting up the mobile version for the first time and link the same Nintendo Account you use with the Nintendo Switch version, you will be able to share save data between versions.
Save data can be shared through your Pokémon Trainer Club account in the same way, provided you link the same Pokémon Trainer Club account to both versions.
[If you have only played the mobile version before]
You must log in using the same account you have used before. The following accounts can be linked to the mobile version:
・Pokémon Trainer Club account
・Apple ID (iOS only)*
*Not available for players aged 15 years or younger.
*Age restrictions may vary depending on your region of residence.
If you have previously played using a guest account (without linking an account) and have not linked any of the above login accounts, you will not be able to transfer save data.