How do I do "Friend Check"?
Also, to connect via the Entree Link, do my friend and I have to have reached Black City/White Forest?
1. I think you might mean "Feeling Check". Just touch "IR" on the C-Gear and then select "Feeling Check". This requires a second DS to link up to, and can only be done once a day. You can get Sweet Hearts from this.
2. Nope, Entralink can be accessed at any time.