When you don't turn on the C-Gear in the beginning of the game (B/W/B2/W2), it tells you that some features will be restricted. Exactly what restrictions are they?
well, basically, it means you cant use these things: Online IR Wireless you also cant mess around with it and change stuff on it while it is off, such as customizing it. One last thing, surveys cant be checked with the C-Gear off.