Entei

Unfortunately, Entei's place in UU is non-existent. Although Entei boasts a relatively impressive Attack stat, a reasonable Speed tier, access to the incredible move Sacred Fire, which has a 50% chance to burn opposing targets, and a solid priority option in Extreme Speed, that's where its good traits end. Sacred Fire, Stone Edge, and Extreme Speed aren't nearly as spammable as Entei would like due to their small PP number, and Entei's lack of a boosting move or generally impressive coverage means that it's entirely outclassed as a Fire-type wallbreaker by Infernape, which can more effectively run a Choice Band set thanks to it having a better Speed tier and STAB priority options, which allow it to adequately revenge kill faster threats such as Mega Sharpedo and Choice Scarf Krookodile and Hydreigon. Furthermore, unlike Entei, Infernape only takes neutral damage from Stealth Rock, meaning that it has more opportunities to be brought into the battlefield. Furthermore, thanks to having decent mixed offensive stats and access to Nasty Plot and Swords Dance, Infernape is able to run multiple sets, making it much less one-dimensional than Entei.