My rarest was Omegamon Alter-B: Lvl: 60 (Role: Villain?)
My first time going through I ended with Justimon: Lvl: 48 Role: Hero.
I wanted to try to go for a normal Omegamon but ended up with Alphamon or KaiserGreymon, through Agumon. Since that failed I tried for an Alter and ended up with Alter-B in the end through BlackAgumon!