Hi Zoe! Nice to meet you! My name is Brittany and I just saw that you are a new PC member just like me:) (I joined like 2 days ago). I mainly joined because I have been a pokemon fan since like 1996 and I wanted to connect with other Pokemon fans. I've been playing the games since they first came out so if you have any questions, you can always ask me and I can try to help if you don't want to post a massive feed. And I'm pretty sure friend codes are a set of numbers you get eventually in the game where you can join with others by getting their "friend codes" and it makes it so you can trade and battle with them by using a wifi connection. I hope that helps.