Yeah, here are some frequently asked questions about the WiFi:

How do you "Amor" or "DNA" Digivolve correctly?
Its complicated. For armor, you need a Digi-Egg, but thats solo, not wifi. DNA digivolving is forcing your digimon to digivolve into something with another digimon, but thats not WiFi either. Go look on Gamespot or something.
Do you need someone's friend code to fight?
My WiFi thing is broken, so I can't answer now. Help, anyone?
When you coop digivolve, if you CAN, who gets the egg?

When two people use seperate digimon to digivolve, they both get an egg.

When my WiFi thing is up, I will verify this info. You can find out more from your local library! *stare*