Amoonguss

Amoonguss is one of the best pivots in the RU tier, sporting impressive bulk and a handful of useful resistances as well as an excellent ability in Regenerator, which together allow it to switch in and out repeatedly without much support. Its movepool, while fairly shallow, is tailored to this role perfectly, and in particular contains the coveted Spore. Between these attributes, Amoonguss is capable of taking on a variety of Pokemon, including Sceptile, Feraligatr, and Galvantula, throughout the course of a battle without much fuss.

However, even with all the positive attributes Amoonguss sports, it does get held down by several notable negatives. Amoonguss's low Speed and mediocre Special Attack make it extremely exploitable by a variety of offensive threats after Spore has put something to sleep. Even with Spore available, sleep is a status that is highly prepared for in RU, with nearly every team utilizing any of a Sap Sipper or Vital Spirit user, a Choice user carrying Sleep Talk, Lum Berry sweepers that can take out Amoonguss after a boost, Heal Bell support, or some combination of these to prevent Amoonguss from simply using Spore and incapacitating a Pokemon for the rest of the match. What's more, Amoonguss faces direct competition from its Grass-type cousin Tangrowth, which likewise has access to Regenerator and its own sleep move, while sporting better physical bulk, higher offensive stats, and coverage moves that can better deter common sleep absorbers from switching in for free. While Amoonguss can be a very effective multi-purpose pivot, it must be used with caution in order to avoid being exploited by a metagame well prepared for what it aims to accomplish.