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How to Trade in Pokemon Brilliant Diamond and Shining Pearl - Pokemon Diamond, Pearl and Platinum Guide - IGN
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You can access the Union Room from anywhere in the Sinnoh region by pressing the Nintendo Switch's Y Button while playing Pokémon Brilliant Diamond and Shining Pearl | Pokémon Blog
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How to enter and leave the Grand Underground in Pokémon Brilliant Diamond and Shining Pearl - Dot Esports
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Pokemon Brilliant Diamond and Shining Pearl Update Adds New Colosseum Features, Union Room Functions, and More
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Pokémon Brilliant Diamond and Shining Pearl updated to Version 1.2.0: full patch notes - Meristation
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The Union Room in Pokémon Brilliant Diamond and Shining Pearl allows you to interact with Trainers locally and online in real time, and invite them to battle or trade | Pokémon Blog
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