Iron Tail for coverage, which can be found on Iron Island and really helps out against ice and rock types as well as softens up opponents by having a chance of lowering their defence. For the last spot, there's several options, mainly more technical and status moves than direct attacks. Roar can be good if you want to cycle through your opponent's team to have Houndoom get a more favourable matchup, Protect could help it avoid attacks against opponents with priority moves or you could go with Double Team in the hopes that it can solo teams through evasion.