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Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
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.
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).
Further notes: suspect tests were included in the rankings wherever possible, with weight for that given tier and month being split proportional to the number of battles on each ladder. Example: say there were 10,000 OU battles in March vs. 5,000 OU Suspect battles. Then March's OU ladder would contribute 2/24 to the tiering and March's OU Suspect ladder would contribute 1/24.
Tornadus-Therian moved from BL to OU
Scrafty moved from UU to RU
Gallade moved from OU to UU (edit: moved to RU instead)
Kingdra moved from UU to RU
Mandibuzz moved from OU to UU
Flygon moved from UU to RU
Alakazam moved from UU to OU
Haunter moved from PU to NU
Heliolisk moved from RU to UU
Dragalge moved from BL2 to UU
Mamoswine moved from OU to UU
Hippowdon moved from UU to OU
Fletchinder moved from RU to NU
Sigilyph moved from BL3 to RU
Slurpuff moved from RU to UU
Camerupt moved from NU to RU
Magneton moved from RU to NU
Abomasnow moved from RU to UU
Doublade moved from RU to UU
Cresselia moved from RU to UU
Slowking moved from RU to UU
Noivern moved from UU to RU
Tauros moved from BL4 to NU
Kabutops moved from RU to NU
Seismitoad moved from NU to RU
Prinplup moved from PU to NU
Whimsicott moved from RU to UU
Pinsir moved from RU to NU
These changes will be live on Showdown as soon as someone (not me) makes the changes and the server restarts.
Corphish moved from LC OU to LC UU
Vulpix moved from LC OU to LC UU
Skrelp moved from LC UU to LC OU
Slowpoke moved from LC OU to LC UU
Houndour moved from LC UU to LC OU
Omanyte moved from LC UU to LC OU
Pancham moved from LC OU to LC UU
Gothita moved from LC UU to LC OU
Shellder moved from LC UU to LC OU
Mew moved from Doubles UU to Doubles OU
Weavile moved from Doubles UU to Doubles OU
Chandelure moved from Doubles OU to Doubles UU
Mamoswine moved from Doubles OU to Doubles UU
Volcarona moved from Doubles OU to Doubles UU
Salamence moved from Doubles OU to Doubles UU
Porygon2 moved from Doubles OU to Doubles UU
Meowstic moved from Doubles OU to Doubles UU
Camerupt moved from Doubles UU to Doubles OU
Deoxys-Attack moved from Doubles OU to Doubles UU
Landorus moved from Doubles UU to Doubles OU
Slowbro moved from Doubles OU to Doubles UU
Swampert moved from Doubles OU to Doubles UU
Scrafty moved from UU to RU
Kingdra moved from UU to RU
Flygon moved from UU to RU
Doublade moved from RU to UU
Cresselia moved from RU to UU
Slowking moved from RU to UU
Noivern moved from UU to RU
Whimsicott moved from RU to UU
Other than that, everything about RU changed. They just removed two of the most prominent walls, one of the most popular spinblockers, and one of the most offensive megas in the metagame so far. In turn we got a lot of speedy attackers and a decent defogger. Needless to say, I am hyped for this entirely new metagame.
On another note, it is good that UU shitmons finally drop, and RU's prominent threats have risen up by usage. Quite a drastic shift, should be interesting.
Tornadus-Therian moved from BL to OU: I expected this to happen
Scrafty moved from UU to RU: Yes I can use my favorite Set Up Pokemon
Gallade moved from OU to UU: I honestly didn't expect this as it is a very good pokemon
Kingdra moved from UU to RU: Unexpected
Mandibuzz moved from OU to UU: WOW I never saw that coming
Flygon moved from UU to RU: Awesome
Alakazam moved from UU to OU: Cool but no one would use it still
Haunter moved from PU to NU: IDC
Heliolisk moved from RU to UU: Cool I like Heliolisk
Dragalge moved from BL2 to UU: BL2 is somewhat UU
Mamoswine moved from OU to UU: Ok idk if that was a good idea as most pokemon (mostly the megas) are going to be a pain.
Hippowdon moved from UU to OU: I honestly wish it stayed in UU as its fine where it was.
Fletchinder moved from RU to NU: IDC
Sigilyph moved from BL3 to RU: BL3 is somewhat RU
Slurpuff moved from RU to UU: Cool the RU Belly Drum was to broken I guess
Camerupt moved from NU to RU: Testing in NU said so.
Magneton moved from RU to NU: Thats fine magneton wasn't that great anyway
Abomasnow moved from RU to UU: Cool (No Pun intended) but all the good megas are gone now ;~;
Doublade moved from RU to UU: It was fine in RU why move it to UU?
Cresselia moved from RU to UU: IDC
Slowking moved from RU to UU: Slowbro 2.0
Noivern moved from UU to RU: Finally I wanted this to happen.
Tauros moved from BL4 to NU: BL4 is somewhat NU
Kabutops moved from RU to NU: IDC
Seismitoad moved from NU to RU: IDC
Prinplup moved from PU to NU: IDC
Whimsicott moved from RU to UU: IDC
Pinsir moved from RU to NU: Sucker Lunch is disapoint
Can we make Charizard UU and keep its mega at BL, since you made Pinsir NU, Gallade UU, and Houndoom RU?
Monthly reminder that tier shifts are, as the title of the thread states, decided by usage, so the only way Charizard would fall to UU is if it is used infrequently enough in OU