Nasty plot on Houndoom is a bit ballsy. Houndy usually doesn't have time to power up due to its fragility. Thunder fang isn't the best choice either. You're better off sticking with special attacks. Yeah, thunder fang is good against waters, but they'll easily wipe the floor with you before you can rack up a decent amount of damage on them with it. This is due not only to the fact that T-fang is physical (otherwise it wouldn't be that bad), but it also has low base power and doesn't benefit from STAB.
OTOH, Flamethrower and Dark Pulse are both good attacks, so they're keepers. As for what I'd recommend in place of the other two, I dunno. Too tired to think right now.![]()