Hey all, It's been three months since the last usage-based tier update, so that means it's time for another one! For those new to our system, how our tiers work is that they're primarily based on usage (the names of the tiers, OU, UU, RU and NU, literally mean "Overused," "Underused," "Rarely Used" and "Never Used"): Pokemon that are used heavily in the tier above get banned from the tiers below. The cutoff for each tier is the point at which you're more than 50% likely to encounter that Pokemon at least once in a given day of playing, if you play 20 battles a day. For those that don't feel like doing the math themselves, that number is approximately 3.41%. So that means if a Pokemon is used on 4% of OU teams, it's considered OU and is banned from UU, RU and NU. This 3.41% number is based on stats weighted over the previous three months, with 5/6 of the weighting from the last month, 1/8 from the month before that, and 1/24 from the month before that (ratio of 20-3-1). Finally, for those who are familiar with how we calculate usage stats know, we weight our stats based on player skill rating, and we're calculating stats using a baseline of 1695 for OU and 1630 for UU, RU and NU. To eliminate some numerical anomalies, we're also throwing out teams where the player's RD is greater than 100 (meaning they've had less than ~5 battles under their alt). This decision is detailed in this thread. On top of the usage-based tiers we also have "borderline" or "BL" tiers, which are essentially Ubers banlists for the lower tiers. These lists ban Pokemon that aren't used enough in the higher tiers but are too overpowered for the lower ones. BL banlists are not subject to usage stats, except a BL Pokemon can, of course, move into a higher tier (from BL to OU, from BL2 to UU). Also note that a Pokemon cannot drop more than one tier per update cycle. Say no one used Charizard in OU for the next three months. That would drop it down to UU, even though it had no usage in UU for that period (how could it? It was OU). One more note this month: NU has been around for a while, so in addition to the official tier lists, I'm also publishing an PU banlist. PU (which doesn't stand for anything--it's an English pun--"Pee Ew" is something you say when something smells, and these Pokemon must stink, they're used so little) is the unofficial tier below NU, and starting this month it's going to have a ladder on Showdown. PU is not an official Smogon metagame, which means no official suspect tests, no presence in official tournaments, and no on-site analyses or forum (I believe...), but you can still play it on Showdown, and I'll still be collecting usage stats for it. Turtles all the way down (Move your mouse to reveal the content) Turtles all the way down (open) Turtles all the way down (close) "Where does it end, Antar? Will there be a tier below PU?" The answer is no and yes. There will be no ladder to support the tier below PU, but I will publish a banlist for it in three months. Note that if PU were to go official, it would take on the name NU, and the current NU would get renamed something like BU (Barely Used), at which point the sub-PU tier would become the new PU. If that was confusing for you, you're in good company. I think that covers everything! So without further ado, let me get to the tiers.