Entei

Sacred Fire, a nice Speed tier, and decent bulk all lend themselves to Entei having a fair niche in UU. Sacred Fire's burn chance is Entei's claim to fame, making it immensely frustrating for even Fire-resistant foes like Rhyperior and Salamence to switch into. Entei is able to outspeed and threaten common threats like Scizor, Tangrowth, and Celesteela. Good bulk alongside a pure Fire typing grants Entei a decent amount of defensive utility and makes it a short-term check to Pokemon such as Jirachi and Zarude. Entei's biggest drawbacks are its Stealth Rock weakness and lack of longevity, which is exacerbated by Flare Blitz recoil. Entei also struggles with various bulky Water-types in the tier, namely Slowing, Rotom-W, and RestTalk Primarina. It struggles during long games due to its low-PP moves and can be awkward to build around due to its demand for team support.