Honestly, I've struggled to win with that team, too. XD; I feel like my game is rigged half the time too, so it's possible that they all are. That or we both have bad luck. :S Sorry there isn't any better advice I can give you.
No problem. They also put down Houndour because it has Dark-type attacks, and it has stronger attacks than Houndoom. Definitely do whatever works for you, though~
The guide suggests a team of Kadabra, Onix, Houndour, Machamp, Zapdos and Dewgong for both Rounds 1 and 2. I've personally struggled to winwith this team, but maybe you'll have more luck than me.