Charizard

In the RU tier, Charizard is usually considered to be outclassed by a plethora of other powerful Fire-types, most notably Moltres by virtue of their shared secondary typing. However, Charizard has a few tricks up its sleeve that can make it worth using over its Fire-type brethren. First of all, it has a rather expansive movepool by RU standards, with a wide selection physical and special attacks as well as several boosting moves, the most notable of which is Swords Dance. This last move, when combined with Acrobatics, allows it to function as a physical setup sweeper, which is a role that none of its competitors can fill efficiently. Second, it has usable stats with which to take advantage of said movepool, including a fairly high Special Attack stat and a 100 base Speed stat, which allows it to Speed tie with Timid Typhlosion and Entei, the fastest Fire-types in RU. Third, its hidden ability, Solar Power, raises its Special Attack to unparalleled heights under the sun, making special sets very difficult to wall. That said, it's clear that Charizard has to capitalize on these singular traits if it doesn't want to be outclassed in RU, but even then, unfortunately, it requires a lot of team support to alleviate its shortcomings. In fact, its easily exploitable weaknesses and the prominence of faster threats make it prone to being revenge killed; moreover, Charizard has a terrible 4x weakness to Stealth Rock, which makes Rapid Spin support absolutely necessary.