|Abilities||Early Bird - Flash Fire - Unnerve (Hidden) Solar Power (Mega)|
|Episode First Shown in||Howl Of The Houndoom|
|First Known Owner||Harrison|
|First Game Appeared in|
|National Dex Number||229|
Houndoom is the evolved form of Houndour at Level 24
Houndoom has a black body, with an orange underbelly and snout. It has a long, devil-like tail. It has silver bands on each leg, and three claws on each foot. It has a collar-like object on its neck, with a skull-like design in between. It has curved, gray horns.
The spikes on Houndoom's head have grown much longer, and now point upwards. It has a horse skull-like features around its neck, and its face has much more orange features. The arrow on the tip of its tail is much bigger, and the chains on its legs have unlocked. It's claws are now orange.
Various Houndoom appear in Hue Eclipse.
- Conway's Houndoom debuted in Vs. Houndoom.
- A sick wild Houndoom appeared in Vs. Houndoom. It was protected by its pack and nursed back to health.
- Harrison's Houndoom appeared in Vs. Mewtwo 1, Vs. Mewtwo 2, Vs. Harrison 2 and Vs. Elise. It is Male due to gender differences.
- Tabitha's Houndoom appeared in Magma vs. Aqua. It is Male, and his ability is Flash Fire.
- Team Magma Grunts used Houndoom in Magma vs. Aqua and Vs. Natu.
- Joshua's Houndoom appeared in Vs. Wigglytuff. It is Male, due to gender differences.
- Karen's Houndoom appeared in Vs. Karen. It is Female due to gender differences.
- A racer's Houndoom appeared in Vs. Ponyta.
- Dream Houndoom used by Zombie Rocket grunts appeared in Crisis in the Dream World!
- Cail's Houndoom appeared in Vs. Shadow Hariyama. It is Male due to gender differences.
- Houndoom is the Pokémon used by Wolf.
- It appeared in Forming Teams is Hard. It is Male due to gender differences.
- Thunder Fang
- Odor Sleuth
- Beat Up
- Fire Fang
- Faint Attack
- Foul Play
- Nasty Plot