How do you find your friends secret base in Pokemon platinum? - Answers

First you both have to be in DS Wireless communications, other wise your DS won't sense your friends location or your friend. Then secretly follow your friend to their secret base ( they will be on your DS if your DS and your friend's DS are within range of each other) then wait until they stop and walk to the front of a wall then disappear. Go into the space on the wall where they walked in and it will ask "Do you want to knock?" Say yes then you will be in your friends secret base. If you steal their flag make sure you save the game after you have put their flag in your base other wise all that hard work will be wasted.