1. You'll need to acquire the first gym badge to open up trading. You'll then head to the Pokemon Center and go downstairs. After talking to the npc, leave the Pokemon Center, you can then open up the Union Room by pressing the button 'Y' . Choosing 'Global Room' , then choosing 'Yes, with a Link Code'. Please then type in the 8 digit code we agree upon and we'll then should see each other inside the Union Room. Head towards one another and click 'A' and select trade.