User blog comment:Torres5791/how to have a digiegg??/@comment-134861-20100614231022

You need to wifi link up with someone else at the Digimon Coliseum. Once you've done that, you choose the option to "Match DigiEggs" (something like that), and then choose which of, I think, your partner's Digimon to combine. He'll choose one of yours, and then you match.

I may be wrong, it's been a long time since I've done it. It's pretty clear what to do once you link up, though.