Ash is back and now he’s up against Zatch Bell! Zatch Bell is the one who performs the magic spells, but he needs his master in order to use these abilities. As far as I know, he cannot use any of his stronger spells on his own, which puts him at a great disadvantage. This will be enough to give Ash’s team the edge that they need to win. Zatch Bell can still fight, but his abilities are drastically decreased. Ash wins.
DReager1.com 
So you let ash get his Pokemon but leave zatch without Kiyo. When I requested this battle I specifically said that zatch and Kiyo would be a team.
Well, it doesn’t go both ways. For example, Pikachu doesn’t get Ash. Kiyo has access to Zatch Bell, but Zatch Bell can’t use Kiyo. I figured that you just wanted both of them to fight. That being said, Kiyo vs Ash also came out today and that one is essentially your tag team duel except that Ash has all of his other Pokemon as well. I uploaded a lot of matches today, but you should still be able to see it pretty quickly.
In a hypothetical battle, I would take the Zatch Bell team over Ash and Pikachu