Sham
Go, my Steady!
So here is the thing. Without sound like a deranged fan I think it was Dragonite who sunk the ship. Iris could very well be an excellent trainer and probably could defeat Ash (she did it with Excadrill) but for some reason something keeps possessing her to use Dragonite despite his terrible losing streak. Couple that with Ash’s Dragonite’s out of nowhere tankness from taking all those Dragon type moves and that’s why he won. She also seemed less interested in taking the battle seriously towards the latter end and was just enjoying what was going on.