Yes read the rules xD bla,bla,bla. I will try to help you, but i am not fond to Houndoom and never used it actually on NB, but i think i can kinda figure something out...
-Flamethrower
-Sunny Day
-Solarbeam (i like HP grass more, but i think yours is for in game purpuoses)
-Crunch
Item: I do like Salac berry...and a Timid Nature.
Yeah, that's it, something i consider competitive.