Arena
Free bouts at the Paradise Colosseum (Factorial Area). Later bouts open after a side quest.
Challengers
Searching for Nanimon
DigitamamonLv. 46
BotamonLv. 46
Kings of Big Bad Bugs
Monzaemon and Friends
Lucky Number 100!
SkullMeramonLv. 48Trustworthy Truth-Tellers
Circus in the Red: No Misreckoning
The Royal Flush
Covert Honey Corps: Royal Commandos
Imperialdramon: Paladin Mode
Imperialdramon PMLv. 5550,000 ¥
Omni Blade×1
Omni Blade×1Gatekeepers of Fire & Ice
50,000 ¥
Hey, Kid! You Here for a Fight?!
50,000 ¥
Kings of Pharaohmon
50,000 ¥
Lucemon 2/3
SeraphimonLv. 57
OphanimonLv. 5750,000 ¥
Golchidrarin
50,000 ¥
The Guardian's Guardians
50,000 ¥
Terrier Twins and Their Teacher
100,000 ¥
Mighty Mad Man
After 
A Stubborn Fighter?
GankoomonLv. 5550,000 ¥
Master & Pupil Trio
After The Forgetful Helpers
50,000 ¥
Hero from Shambala
After Susanomon the Hero
SusanomonLv. 70100,000 ¥
Solo Beauty
After A Display of Beautiful Swordplay
LordKnightmonLv. 5550,000 ¥
The True Twentiest
After The Easy Road Is Best
GrademonLv. 5350,000 ¥
Golden Intruders
After Final Battle Challenger
PharaohmonLv. 52
Rapidmon (Armor)Lv. 5250,000 ¥
Marsmon, God of DigiBattles
After The Greatest OMNI Carnival
MarsmonLv. 80300,000 ¥