Can someone PLEASE explain to me how to add someone on my in-game friend list? I understand that you need to put in their friend code for the 3ds but what I don't understand is how to add them on my in-game one. I really want to battle them but can't :/. Can someone please help? Thanks!
If I'm not mistaken, as long as you have your friend added to your 3DS friends list (and they're added to yours), and you're both online on Pokemon X/Y at the same time, they should be added to your friends list automatically.
And I've seen that you've asked in the X/Y help thread already about this, so please be patient or ask again in the future instead of making a thread in another section (especially one that doesn't deal with game-related issues), since they'd know more about it.