You can use your old Nintendo Switch account to enjoy the new Pokemon Unite Nintendo Switch Console where you can play your favorite video games.
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Pokémon UNITE for Nintendo Switch - Nintendo Official Site
How to Access the Same Pokémon UNITE Save Data on Multiple Devices – Pokémon Support
Pokémon UNITE
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Happy 2nd Anniversary, Pokémon UNITE! Mewtwo is ready to celebrate - News - Nintendo Official Site
Pokémon UNITE/Nintendo Switch/eShop Download
Pokémon UNITE for Nintendo Switch - Nintendo Official Site