These days, most of us make events. That's obviously slightly problematic for a level two novice.
Fight club can also be used to challenge others.
Of course, if you're asking for the reason I'd guess, having a fight history where you only win against one specific other person is slightly suspicious. Try fighting in the level 1-5 room randomly. It's actually much easier to win once you get the hang of how the game flows, and doubles are not allowed and are a bannable offense