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https://pokemonblog.com/2021/01/11/zarude-serial-codes-now-being-distributed-via-the-pokemon-trainer-club-newsletter-in-europe-codes-must-be-redeemed-by-march-31-2021/
Zarude serial codes now being distributed via the Pokémon Trainer Club newsletter in Europe, codes must be redeemed by March 31, 2021