This one could be close,and I imagine it would take a while because they both are dark type Pokemon,and it only knows two moves Night Daze and Shadow ball,which is a ghost type and dark type move,while Yamato-san's Delvil knows four moves Ember,Flamethrower,Bite and Smog,so Yamato-san more of an assortment of moves..so I'd have to think this would be rather close but Zorua might win.

I like houndour too