I have so many fights I would like to see but since this is late I'll talk about just this one! Jellal Fernandez vs Mystogan!
And to be fair since Mystogan went back to his home world and no longer has magic let's use their respective strengths right before the Edolas Arc. Mystogan has always been one of my favorite characters even before I knew who he really was. For my pick I'm going with Mystogan as much as I like Jellal and his True Heavenly Body Magic I'm going to be a little biased and stay with Mystogan!