Swapping is a big deal in Pokémon games, but players who don't have much experience with older titles in the series may find Brilliant Diamond and Shing Pearl a little obscure when it comes to swapping mechanics.
Many players will be used to using Y-Comm, but this is not present in these games. In this guide, we'll break down how to trade so that you can trade Pokémon with your friends and other people on the internet.
To trade, you'll need to visit a Poké Center anywhere in the game. Go down the escalators and talk to the NPCs at the counter. They will ask you if you want to enter the Global Room. Select the option "Yes, with a linking code". You will then be prompted to set up a linking code. When you do, you give the linking code to the person or persons you wish to trade with.
You can have more than one person in a Global Room with you, so don't be afraid to set up a small trading group there if you wish. Trading can be incredibly useful when it comes to getting Shiny Pokémon. Remember, if you can get a Pokemon from a player in another country, you can use it to breed with your country's Pokemon, greatly increasing the chances of getting a Shiny.