Make sure you tell people through PMs or something that you added them, because you both need to add each other in order to communicate. No use adding someone, and they don't know you added them.

Update: Just got the Excavation Kit. Access to the Sinnoh Underground! Secret Base is set up, but I'll probably move it. The underground is actually a lot more feature-rich than I thought it would be. It's like an entirely different game. Also, I know the reward for getting capture the flag now.

Pokemon <3