Misdreviousis a baby II? I would argue Rookie, Misgamius would me champion by Pokemon logic, but you were the interperator :p I would Argue Gatomon Rookie if it wasn't fact of her being a champion. Digimon logic is a bit more fair.
If Witchmon is a Pokemon she would be Psychic (Witch), Dark (Demon type digimon), champion level. Witchmon would know Psychic, Dark Pulse, Shadowball TM.. but is it fair to give her pokemon attacks. How bout this. I'll argue witchmon in the pkmn universe, and you give mistradues digimon traits, and yeah. Do you understand?
But then how well would that work against Ghost? If it's a battle of levels, Witchmon's attacks would have more Power but the defenses of Mis could alter the power. Then we don't know what Witchmon is weak to. Would Mis have HMs? If not, what then? If so, what then?
We have to consider two things here. We are not going based off fandom we are going off facts. Witchmo knows like two attacks, also Missy we do not know if she was trained or not because a +6 Shadow Ball kills things.
Hmmm... Fandom Mis would. If fandom Mis was not added, then Witchmon. In a battle of raw power, Witch > Mis. If Mis is able to use trickster magic, which Witchmon has no experience facing, Mis would be able to spam the power she had from angles and overall use strategy against Witch.