Houndoom

Houndoom's typing gives it a powerful secondary Dark-type STAB move that much of the tier struggles against, lets it counter Pokemon like Ninetales, Necrozma, and Sigilyph in conjunction with its ability, helps it act as an offensive check to a plethora of Psychic-, Ghost-, and Fire-types, and gives it a good matchup against priority users like Toxicroak and Abomasnow. Houndoom has a great Speed tier, outpacing threats like Roserade, Toxicroak, and Gardevoir. A decent support movepool gives Houndoom options like Taunt that let it completely obliterate stall, shutting down staples such as Pyukumuku and Cresselia. However, Houndoom's bulk, particularly physically, leaves much to be desired and limits its setup opportunities. A glaring weakness to every entry hazard in the game, especially Stealth Rock, further limits its ability to set up and makes it difficult to check Ghost-, Psychic-, and Fire-types. Dark Pulse's low Base Power leaves Houndoom very reliant on its Z-Move against Water-types such as Milotic, meaning it'll be helpless against them if another Pokemon can successfully lure its Z-Move. Other Fire-types such as Salazzle and Ninetales are usually more consistent picks due to their amazing Speed and much better damage output, respectively.