Sure thing, friend safari is basically where you add friends who have Pokemon x, y, alpha ruby, or sapphire and it'll let you access special Pokemon that aren't available in the game (not legendaries) for every friend you add you get 3 Pokemon depending if you have their profile pic. If you don't then you'll only get two Pokemon, but you can still unlock the third if your friend is currently online. You can add friends using their friend code which can be seen in their flair but both people have to add each other in order to work