Quote Originally Posted by NeoCracker View Post
....You unlock Dark Link by walking around with your DS in sleep mode. You unlock gameplay options by doing something that in no way shape or form involves you playing the game.

You are indeed getting trout for not playing the game.
You're getting a single type of fight. They're short, and they don't really impact the main game at all. Oh, and the game will give them to you even if you never pass by anyone (something else a lot of the good games do with it, such as Awakening's StreetPass teams or Bravely Default's Update Data).