This is definitely a match that Renamon can win. “Even though he is a mega, this Digimon is virtually powerless and it can defeat a champion level opponent when in great numbers.” I’m paraphrasing a little from the Digimon wiki regarding Dokugumon’s Mega form, but that’s pretty sad when you think about it. Renamon’s champion and ultimate forms are not particularly impressive, but her Mega form would easily crush Dokugumon and Renamon may stand a decent chance in her rookie form. That may be pushing it a bit, but she definitely wins this round with ease. Renamon wins.