Welcome to the RBY OU Viability Rankings! As you can guess, in this thread we aim to rank the viability of all relevant Pokemon in the RBY OU Metagame. All Pokemon are ranked in order of viability, even in their own subranks. The VR will be updated once a year, once Smogon Premier League ends, where everyone will be encouraged to post their new yearly personal VR. From there, we will use the Quantitative Tiering in Viability Rankings system to update the VR. You can find the old Viability Rankings thread as well as the '19/'20/'21/'22 updates below.
2013 - 2016 Thread
2016 - 2020 Thread
S Rank: Reserved for Pokemon which pose a very significant offensive or defensive threat, consistently harming or walling the opposing team. The roles these Pokemon can fulfill are crucial, if not mandatory, for RBY teams and these Pokemon are the best at their certain roles.
A Rank: Reserved for Pokemon that are outstanding in the RBY metagame. These Pokemon pose a significant offensive or defensive threat to most teams. If these Pokemon have flaws, they are often outshown by their strengths.
B+ Rank: Reserved for Pokemon who are very good in the RBY metagame, yet are somewhat inconsistent. These Pokemon may have flaws, but they have positive aspects which makes them stand out, making them valuable members of a team.
B/C Rank: "The Slowbro Tier"
C+ Rank: Reserved for Pokemon that have solid niches in the RBY metagame, but nonetheless are generally inconsistent. These Pokemon have definite flaws, but may have positive aspects which can make them worth using.
D+ Rank: Reserved for Pokemon that are mediocre in the RBY metagame, but are decent enough to pose a threat at times, usually out of surprise. These Pokemon have a small niche in the metagame and are often not worth using.
E Rank: Reserved for Pokemon that are very mediocre, they are very dependent on surprising the opponent to pose any threat. These Pokemon are almost entirely outclassed, with little to no niche, they are rarely worth using.