Houndoom

Although it might seem like it doesn't pack enough power, Houndoom is still a viable Pokemon to use in the tier. Its unique typing and its amazing ability in the form of Flash Fire provide Houndoom with an amazing offensive STAB combination, and gives it the ability to resist or be immune to Victini's STAB moves and proceed to either trap it with Pursuit or strike first with Sucker Punch. It also has access to stat boosting moves such as Nasty Plot, which doubles Houndoom's Special Attack in a pinch, making it a force to be reckoned with. It also has decent offensive stats: 90 / 110 / 95 is a gift for Houndoom, giving it a bit more unpredictability due to the ability of going mixed or purely specially offensive. 95 base Speed is a benchmark that guarantees Houndoom will outspeed Heracross, Roserade, and Nidoking, threatening them all with its STAB moves, although it gets outpaced by the common base 100 Speed Pokemon running around in the tier, such as Shaymin, Zapdos, and Flygon. It also has access to priority moves such as Sucker Punch, meaning it can stand up to powerful threats and strike before them or score a quick revenge kill. However, Houndoom has a very limited and effective movepool, almost reduced to its STAB moves. Moreover, it is extremely frail, thus going down easily to a super effective move. In addition, Houndoom is weak to the most common types present in the tier. Despite its flaws, with the correct support, Houndoom can still punch holes in the opponent's team if they don't pack a safe check.