Registeel

Registeel arguably is the best out of the original three Regis. It hasn't changed much since its release but still is a solid check to numerous Pokemon in UU. Registeel is one of the best counters to offensive Roserade, Raikou, and non-Tinted Lens Yanmega with its spectacular base 150 in both defensive stats. It boasts 11 resistances and 1 immunity in exchange for 3 common weaknesses. Registeel faces competition from other Steel-types, however, including Bronzong, Cobalion, and Empoleon. To hinder Registeel even more, it lacks reliable recovery, making it able to be worn down easily. Its three weaknesses are also a big detriment, as they leave Registeel vulnerable to popular threats such as Victini and Heracross. Nevertheless, don't let these cons discourage you from using Registeel, as it is still a solid wall.