[@tobiax] 
I had to rummage around the wikias. I found one line of evolution that can work. Here it is:
Mokumon => Petimeramon => Candamon => Wizardmon => Wisemon => Ancient Wisemon
The alternative (which I think is superior and prone to more comedy):
Botamon => Koromon => [i]Kakase[/i] Agumon => and previously stated
If it will draw away from the story, I'll go with the former. But... if I can go with the Kakase Agumon line, hooo hooo hooo! I could imagine the dynamic between my character and Kakase