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'''Tiers''' are an attempt by players to classify {{OBP|Pokémon|species}} in a given [[generation]] by their utility or popularity in competitive battles. The classification of Pokémon into tiers can be challenging, as a Pokémon's [[statistic]]s or [[move]]s are not the only factors that can impact a match. Combinations of Pokémon, along with player skill and overall strategy greatly affects the outcome.
'''Tiers''' are an unofficial method of classifying {{OBP|Pokémon|species}} within a particular competitive battling format based on their relative usage.


==Tiers in Pokémon==
Individual sites, users, or organizations may publish tiers, but the most prominent tier lists are produced and published by [[Smogon]], usually based on usage stats from unofficial battle simulators, currently [[Pokémon Showdown]]. Communities such as [[Pokémon Online (battle simulator)|Pokémon Online]] and [[Pokémon Perfect]] have also published their own tier lists, though they are defunct as of 2023. Pokémon Online is of particular note for introducing usage-based tiering, the system most commonly used today. Tiers are defined separately for each generation, with their own rulesets, bans, and often even communities.
Pokémon features [[List of Pokémon|hundreds of species]] available for use in a battle, with great variation in [[base stats]], movesets, [[Type]]s, and {{Abilities}}. Individual sites, users, or organizations may publish tiers, but the most prominent tier lists are produced and published by [[Smogon]] and [[Pokémon Online]] and usually based on statistics from [[Pokémon Showdown]]. Tiers for current [[Appendix:Metagame terminology|metagames]] are updated on a regular basis to reflect the current competitive battling environment; older generations tend to retain the same banlists. Pokémon do not necessarily have high [[statistic]]s to be in high tiers. For example, {{p|Pelipper}} is usually tiered much higher than {{p|Slaking}} because of their abilities, despite Slaking's stronger stats.


Tier lists are often targets of discussion because there is no "official" tier list for Pokémon. Tiers are often quite fluid—as strategies evolve, Pokémon may move from one tier to another. However, even official tournaments will present lists of disallowed Pokémon.
==Purpose==
Each tier functions as its own metagame, where only Pokémon that aren't in a higher tier can be used. By categorizing Pokémon in this way, Pokémon that would normally be outclassed in higher-tier metagames can still be useful in lower-tier formats, much like {{wikipedia|weight class}}es in sports like boxing. This also allows for rules to be enacted that better accommodate the Pokémon in that metagame that would not be suitable for those in higher tiers. Thus, the purpose of tiers can be boiled down to ensuring that as many Pokémon are viable as possible.


As commonly defined, a "standard" battle allows any Pokémon not listed in the Uber tier. Tiers are exclusive in only one direction; for instance, in a UU battle, Pokémon from tiers above UU (OU or Uber) are banned, but Pokémon from lower tiers (such as RU or NU) are allowed.
In addition to usage-based metrics, some Pokémon are banned from a tier due to being considered too powerful for that tier's metagame. These can be for metagame health, being statistically overwhelming, or having strategies that players of the tier consider uncompetitive. In doing so, the tier can become more diverse, allowing for more Pokémon to be playable in the problem Pokémon's absence.


A common addition to the tiers below may be several "Borderline" or "Banlist" tiers ("UUBL", "RUBL", and so on). Players can vote Pokémon into a borderline if said Pokémon are "broken" for one tier, but not sufficiently used in the next tier to be a part of it. Pokémon are banned usually because they are very difficult to counter without specifically preparing for them. In other words, battles involving "broken" Pokémon are more likely to be decided by team matchups and the presence of specialized counters rather than "player skill".
==Methodology==
Tiers for the latest generation of games are typically updated more often than older generations, due to those usually being the most played formats and being usage-based. Usage-based tiering is conducted through battle simulators such as [[Pokémon Showdown]] collecting aggregate data on the Pokémon used in a given metagame and weighting it based on the player's Elo rating. The weighted usage percentage is used to prevent "noise" — such as outliers who use a Pokémon a considerable amount and invariably lose — from potentially resulting in unrepresentative data. Once the result is unveiled, Pokémon are then risen and dropped between tiers that they are perceived as being better suited for, with an objective usage percentage being employed. With this system, when a new generation of Pokémon begins, it can take multiple months for a new tier to become playable. Due to usage-based tiering relying on a considerable amount of players, once a generation has concluded, the data becomes extremely unreliable. Ergo, old generations of metagames are often locked once the next one begins, with the tier list considered complete and lower tiers being stabilised. However, retroactive bans may be enacted by those who continue to play the metagames, and Pokémon that fall out of favour may be marked as such on battle simulator platforms while still being kept in the tier for the sake of transparency.


Below are six of the most common tiers.
In Generations I through III, usage-based tiering was not invented yet and they thus instead use viability-based tiering. With the disadvantages of usage-based tiering becoming impossible after a generation has concluded not being applicable, small communities of enthusiasts still tier these generations in small competitive communities, with websites like [[Pokémon Perfect]] notably being founded for this very purpose. Viability-based tiering is conducted through having tier lists for the metagame itself — dubbed "Viability Rankings" — produced through aggregate rankings either by qualified players or a general large-scale vote. Pokémon are sent up and down tiers based on their perceived viability in the current metagame, usually with a rank being used as the threshold, mirroring that of the given percentage in usage-based tiering.  


===Ubers===
==Classification==
The Ubers tier is effectively a banlist for the OU tier, as "standard" battles allow everything in the OU list and below. Players can, similarly to BL tiers, vote to ban Pokémon to Ubers if said Pokémon are too "broken" to the OU [[Appendix:Metagame terminology|metagame]] to allow.
If a Pokémon meets a certain threshold of usage within a particular tier, it is classified as being within that tier, and cannot be used in any lower tiers. A Pokémon's classified tier is only its lower limit; it can still be used in any higher tier. Some Pokémon may still be useful in higher tiers despite their classification but are simply not widely used, and vice versa; so while a strong guideline, usage does not necessarily equal viability. Additionally, some Pokémon — most famously {{p|Quagsire}} — may ebb in and out of metagames, thus travelling up and down tiers rapidly.


The Uber tier may include any Pokémon, not necessarily just [[Legendary Pokémon]]. Typically, it includes most {{pkmn2|Legendary}} [[game mascot]]s except [[List of Pokémon with form differences#Kyurem|Black]] {{p|Kyurem}}, due to various factors preventing it from becoming "too centralizing". Although many legendary Pokémon reside in the Uber tier, a far larger number exists in lower tiers due to similar inadequacies.
If a Pokémon has multiple forms that it cannot switch between within battle, those forms may have usage calculated separately from each other (eg. {{p|Giratina}}'s Altered and Origin formes). However, if the form difference is purely or mostly aesthetic, those forms are often grouped together and tiered on their own (eg. {{p|Gastrodon}}).


After the release of [[Pokémon Omega Ruby and Alpha Sapphire]], due to the dominance of [[Mega Evolution|Mega]] {{p|Rayquaza}}, Smogon made their version of Ubers a full-fledged tier, allowing bans from Ubers. Smogon has also banned the move {{m|Baton Pass}} from their version of Ubers. However, unlike other tiers, it is not affected by usage. As a result, Smogon also endorses a playstyle referred to as "Anything Goes", which has no fan-imposed rules other than the "Endless Battle Clause".
If a Pokémon is banned from a tier, it is placed in a special BL (Borderline) group for that tier, meaning it cannot be used within the tier it's designated for, regardless of its usage. However, it can still be used in higher tiers. "BLs" are not considered to be officially playable tiers.


===OverUsed===
Because the metagame shifts over time, as well as Pokémon being banned and unbanned, Pokémon's usage within a given tier will vary over time. At certain points in time, the publisher of the tier system will update which Pokémon are in which tiers based on current usage or viability.
OverUsed, commonly abbreviated as "'''OU'''", refers to Pokémon that are most frequently used in [[standard play]]. Pokémon in this tier are often Legendary or {{pkmn2|Mythical}} and almost always fully evolved.


OU status does not have to do with a Pokémon's power or ability. The Pokémon that make up OU, as with all tiers, are determined based on usage. If an OU Pokémon is not used enough in the OU tier, it will fall to the UU tier, and "not used enough" usually means that a player can play 20 battles and have less than a one-half chance of encountering an opponent using said Pokémon. (i.e. appears on less than approximately 3.4% of teams) A Pokémon's tier may change from generation to generation. For instance, {{p|Magneton}} is often considered OU in [[Generation III]] because of its advantage over {{p|Skarmory}}, another commonly used Pokémon. In [[Generation IV]], {{p|Magnezone}}, the evolution of Magneton, took Magneton's role in OU in some tier lists due to its generally higher base stats.
==Tiers==
Different generations have different numbers of tiers. Newer generations have more Pokémon and more interest, so typically have more tiers as a result. Publishers of tier lists usually only create new tiers when there is enough interest in them to justify maintaining that new tier.


===UnderUsed===
Tiers are normally ranked as follows.
UnderUsed, commonly referred to as "'''UU'''", consists of Pokémon that are not used enough to be in OU. Pokémon classified as UU are often outclassed by Pokémon in higher tiers, possibly as a result of generally lower base stats, available moves, or Abilities. For example, in Generation V, {{p|Machamp}} fell to UU in some tier lists largely as a result of the introduction of {{p|Conkeldurr}}, which has {{m|Mach Punch}}, {{m|Drain Punch}}, and generally superior base stats. UU Pokémon are sometimes used in OU battles, but most have smaller niches. If a UU Pokémon is not used enough in the UU tier, it will fall to the RU tier.
#AG (Anything Goes, taken from the ''Stadium'' series of games)
#Ubers ([[wiktionary:Uber|German for "above competition"]], not normally tiered by usage)
#OU (OverUsed)
#UU (UnderUsed)
#RU (RarelyUsed)
#NU (NeverUsed)
#PU ([[wiktionary:PU|expression of disgust]])
#ZU (ZeroUsed, unofficial)


===RarelyUsed===
Some publishers of tier lists used the LU (Little Used) tier in place of RU or changed their definitions to be clearer (eg. 1U, 2U, etc). However, due to the prominence of Smogon's tier list, Smogon's terminology has dominated most tier lists.
RarelyUsed, commonly referred to as either "'''RU'''". The tier consists of Pokémon that are not used enough to be in UU. For example, {{p|Escavalier}} is considered RU in Generation V in some tier lists because it is not used enough in UU battles. If an RU Pokémon is not used enough in the RU tier, it will fall to the NU tier.


===NeverUsed===
==Metagames==
NeverUsed, commonly referred to as "'''NU'''", consists of Pokémon that are not used enough to be in RU. The name is not literal, stemming from the tiers of [[Generation I]], where Neverused Pokémon had generally lower "competitive value" in comparison to other Pokémon. Some Pokémon that are pre-evolutions of Pokémon in higher tiers may be classified as NU.
Each tier functions as its own metagame, with its own banlist, normally referred to as the tier's name appended with BL (e.g. UU-BL). However, OU's banlist has its own unique name, Ubers. Playing without any restrictions (or only very specific rules such as the "Endless Battle Clause") is typically referred to as "Anything Goes," which has since been adopted as the banlist for Ubers.


===PU===
Unlike other banlists, Ubers functions as a metagame itself. Due to its functioning as a metagame, Ubers has its own banlist dubbed "Anything Goes", for Pokémon that are considered too unhealthy even within its own metagame. This technically began in [[Generation IV]] with {{p|Arceus}} due to technical difficulties on [[Shoddy Battle]], but officially beginning in [[Generation VI]] with Mega {{p|Rayquaza}}'s official ban from Ubers. Unlike tiers, Ubers is not based on usage, so usage within Ubers does not result in a Pokémon ceasing to be in the OU tier, though tiering from Ubers has historically been proposed.
PU consists of Pokémon that are not used enough in NU. Some Pokémon in PU are not fully evolved or have lackluster stat distribution. Unlike the other tiers, PU is not an acronym, coming from the expression of disgust "PU".


===Untiered===
In addition to banning specific Pokémon, each format may also ban certain moves, Abilities, items, or even the usage of particular game mechanics (such as [[Dynamax]] or the [[Terastal phenomenon]]). They may also issue bans on certain combinations of these, such as a party not being allowed to have two named moves at the same time (particularly involving {{m|Baton Pass}}), though this is considerably rarer and subject to extreme contextual circumstances.
Untiered is a list of all Pokémon that are not used enough in PU and is not a playable tier. Generally, the use of Untiered Pokémon in a competitive metagame is strongly discouraged.


==Tiers in special formats==
Battle simulators typically offer tier-based formats by default, automatically enforcing the restrictions associated with them. To play with these formats in the games themselves, both players need to agree to the rules in advance, as in-game rule-creation options typically do not offer enough granular control over the rules to support these formats. Due to both the difficulty of enforcing these rules in-game and the availability of usage data, tier lists are usually based on usage within battle simulators.
===Little Cup===
{{main|Little Cup}}
Little Cup is an entirely separate battle style where only the Pokémon that are the lowest evolutionary stage in their family are allowed, like {{p|Bulbasaur}} and {{p|Mienfoo}}. Pokémon that do not evolve at all, such as {{p|Luvdisc}}, are not allowed in the tier. The moves {{m|Sonic Boom}} and {{m|Dragon Rage}} are also prohibited. All Pokémon must be level 5 or lower to compete.


This format is based on the [[Stadium Cup]].
==Format types==
Fans usually discuss tiers in the context of standard Single Battles. However, tier systems have also been published for other variants, such as [[Double Battle]]s, Middle Cup, and [[Little Cup]] Single Battles. Tier systems for these format types function in the same way, but typically do not have as many tiers as standard Single Battles due to the lower popularity of these format types.


Some unevolved Pokémon—for example, {{p|Meditite}}, {{p|Scyther}} and {{p|Gligar}}—are sometimes considered broken and banned in some tier lists. In this special battle style, [[Berry Juice]] is also sometimes banned.
Similarly, some sites (such as Smogon) create their own custom Pokémon, and have format types that include those Pokémon with their own tier lists, in this case being called Create-A-Pokémon (CAP).
 
[[Eviolite]] is one of the most commonly used items in this format, because it can boost the Defense and Special Defense of any legal Pokémon in this format by 50%.


==External links==
==External links==

Latest revision as of 10:16, 28 December 2023

Tiers are an unofficial method of classifying Pokémon within a particular competitive battling format based on their relative usage.

Individual sites, users, or organizations may publish tiers, but the most prominent tier lists are produced and published by Smogon, usually based on usage stats from unofficial battle simulators, currently Pokémon Showdown. Communities such as Pokémon Online and Pokémon Perfect have also published their own tier lists, though they are defunct as of 2023. Pokémon Online is of particular note for introducing usage-based tiering, the system most commonly used today. Tiers are defined separately for each generation, with their own rulesets, bans, and often even communities.

Purpose

Each tier functions as its own metagame, where only Pokémon that aren't in a higher tier can be used. By categorizing Pokémon in this way, Pokémon that would normally be outclassed in higher-tier metagames can still be useful in lower-tier formats, much like weight classes in sports like boxing. This also allows for rules to be enacted that better accommodate the Pokémon in that metagame that would not be suitable for those in higher tiers. Thus, the purpose of tiers can be boiled down to ensuring that as many Pokémon are viable as possible.

In addition to usage-based metrics, some Pokémon are banned from a tier due to being considered too powerful for that tier's metagame. These can be for metagame health, being statistically overwhelming, or having strategies that players of the tier consider uncompetitive. In doing so, the tier can become more diverse, allowing for more Pokémon to be playable in the problem Pokémon's absence.

Methodology

Tiers for the latest generation of games are typically updated more often than older generations, due to those usually being the most played formats and being usage-based. Usage-based tiering is conducted through battle simulators such as Pokémon Showdown collecting aggregate data on the Pokémon used in a given metagame and weighting it based on the player's Elo rating. The weighted usage percentage is used to prevent "noise" — such as outliers who use a Pokémon a considerable amount and invariably lose — from potentially resulting in unrepresentative data. Once the result is unveiled, Pokémon are then risen and dropped between tiers that they are perceived as being better suited for, with an objective usage percentage being employed. With this system, when a new generation of Pokémon begins, it can take multiple months for a new tier to become playable. Due to usage-based tiering relying on a considerable amount of players, once a generation has concluded, the data becomes extremely unreliable. Ergo, old generations of metagames are often locked once the next one begins, with the tier list considered complete and lower tiers being stabilised. However, retroactive bans may be enacted by those who continue to play the metagames, and Pokémon that fall out of favour may be marked as such on battle simulator platforms while still being kept in the tier for the sake of transparency.

In Generations I through III, usage-based tiering was not invented yet and they thus instead use viability-based tiering. With the disadvantages of usage-based tiering becoming impossible after a generation has concluded not being applicable, small communities of enthusiasts still tier these generations in small competitive communities, with websites like Pokémon Perfect notably being founded for this very purpose. Viability-based tiering is conducted through having tier lists for the metagame itself — dubbed "Viability Rankings" — produced through aggregate rankings either by qualified players or a general large-scale vote. Pokémon are sent up and down tiers based on their perceived viability in the current metagame, usually with a rank being used as the threshold, mirroring that of the given percentage in usage-based tiering.

Classification

If a Pokémon meets a certain threshold of usage within a particular tier, it is classified as being within that tier, and cannot be used in any lower tiers. A Pokémon's classified tier is only its lower limit; it can still be used in any higher tier. Some Pokémon may still be useful in higher tiers despite their classification but are simply not widely used, and vice versa; so while a strong guideline, usage does not necessarily equal viability. Additionally, some Pokémon — most famously Quagsire — may ebb in and out of metagames, thus travelling up and down tiers rapidly.

If a Pokémon has multiple forms that it cannot switch between within battle, those forms may have usage calculated separately from each other (eg. Giratina's Altered and Origin formes). However, if the form difference is purely or mostly aesthetic, those forms are often grouped together and tiered on their own (eg. Gastrodon).

If a Pokémon is banned from a tier, it is placed in a special BL (Borderline) group for that tier, meaning it cannot be used within the tier it's designated for, regardless of its usage. However, it can still be used in higher tiers. "BLs" are not considered to be officially playable tiers.

Because the metagame shifts over time, as well as Pokémon being banned and unbanned, Pokémon's usage within a given tier will vary over time. At certain points in time, the publisher of the tier system will update which Pokémon are in which tiers based on current usage or viability.

Tiers

Different generations have different numbers of tiers. Newer generations have more Pokémon and more interest, so typically have more tiers as a result. Publishers of tier lists usually only create new tiers when there is enough interest in them to justify maintaining that new tier.

Tiers are normally ranked as follows.

  1. AG (Anything Goes, taken from the Stadium series of games)
  2. Ubers (German for "above competition", not normally tiered by usage)
  3. OU (OverUsed)
  4. UU (UnderUsed)
  5. RU (RarelyUsed)
  6. NU (NeverUsed)
  7. PU (expression of disgust)
  8. ZU (ZeroUsed, unofficial)

Some publishers of tier lists used the LU (Little Used) tier in place of RU or changed their definitions to be clearer (eg. 1U, 2U, etc). However, due to the prominence of Smogon's tier list, Smogon's terminology has dominated most tier lists.

Metagames

Each tier functions as its own metagame, with its own banlist, normally referred to as the tier's name appended with BL (e.g. UU-BL). However, OU's banlist has its own unique name, Ubers. Playing without any restrictions (or only very specific rules such as the "Endless Battle Clause") is typically referred to as "Anything Goes," which has since been adopted as the banlist for Ubers.

Unlike other banlists, Ubers functions as a metagame itself. Due to its functioning as a metagame, Ubers has its own banlist dubbed "Anything Goes", for Pokémon that are considered too unhealthy even within its own metagame. This technically began in Generation IV with Arceus due to technical difficulties on Shoddy Battle, but officially beginning in Generation VI with Mega Rayquaza's official ban from Ubers. Unlike tiers, Ubers is not based on usage, so usage within Ubers does not result in a Pokémon ceasing to be in the OU tier, though tiering from Ubers has historically been proposed.

In addition to banning specific Pokémon, each format may also ban certain moves, Abilities, items, or even the usage of particular game mechanics (such as Dynamax or the Terastal phenomenon). They may also issue bans on certain combinations of these, such as a party not being allowed to have two named moves at the same time (particularly involving Baton Pass), though this is considerably rarer and subject to extreme contextual circumstances.

Battle simulators typically offer tier-based formats by default, automatically enforcing the restrictions associated with them. To play with these formats in the games themselves, both players need to agree to the rules in advance, as in-game rule-creation options typically do not offer enough granular control over the rules to support these formats. Due to both the difficulty of enforcing these rules in-game and the availability of usage data, tier lists are usually based on usage within battle simulators.

Format types

Fans usually discuss tiers in the context of standard Single Battles. However, tier systems have also been published for other variants, such as Double Battles, Middle Cup, and Little Cup Single Battles. Tier systems for these format types function in the same way, but typically do not have as many tiers as standard Single Battles due to the lower popularity of these format types.

Similarly, some sites (such as Smogon) create their own custom Pokémon, and have format types that include those Pokémon with their own tier lists, in this case being called Create-A-Pokémon (CAP).

External links

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