Snorlax

Thanks to its incredible bulk, offensive prowess, and varied movepool, Snorlax is a near-mandatory Pokemon for every RBY Ubers team. Its Body Slam is incredibly powerful, and few Pokemon can consistently handle it. However, Body Slam isn’t the only weapon Snorlax has in its arsenal. Earthquake and its Ice-type coverage allows Snorlax to deal with Normal-resistant or -immune Pokemon such as Rhydon, Golem, and Gengar. Snorlax also has access to STAB Self-Destruct, which, paired with its base 110 Attack, is the strongest unboosted move in the game. With Self-Destruct, Snorlax is one of the best Pokemon to deal with the kings of RBY Ubers: Mewtwo, Mew, and Chansey. Moreover, in order to increase its physical bulk and longevity, Snorlax can sometimes run Reflect and Rest, allowing it to consistently check opposing Snorlax and Tauros.

However, Snorlax is incredibly slow. With base 30 Speed, it’s slower than every other fully evolved Pokemon except Slowbro. Therefore, Snorlax has to take a hit before acting, meaning it will be easier to KO, especially if Snorlax doesn’t run Rest. Rest is the only option Snorlax has to heal. Once Rest is used, Snorlax becomes passive, giving the opponent the chance to send anything in against it, especially special attackers like Exeggutor, Alakazam, and Mewtwo, which can effectively pressure it with the nuclear Psychic.