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https://pokemonblog.com/2020/10/17/you-can-catch-each-legendary-pokemon-only-once-in-dynamax-adventures-at-the-crown-tundra-in-pokemon-sword-and-shield-expansion-pass/
You can catch each Legendary Pokémon only once in Dynamax Adventures at The Crown Tundra in Pokémon Sword and Shield Expansion Pass