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[[File:Basic Nuzlocke rules.png|thumb|250px|The two basic Nuzlocke rules.]]
The '''Nuzlocke Challenge''' (commonly shortened to just "'''Nuzlocke'''") is a set of rules intended to create a higher level of difficulty while playing the [[Pokémon games]]. Many challengers feel that the rules also serve the purpose of encouraging the use of Pokémon the player would not normally choose and promoting closer bonds with the player's Pokémon. The rules are not an in-game function, but are self-imposed on the part of the player, and thus subject to variation.

The name of the challenge originates from the <span class="plainlinks">[http://www.nuzlocke.com/ comic series]</span> of the same name, which features a {{p|Nuzleaf}} resembling ''{{wp|Lost (TV series)|Lost}}'' character {{wp|John Locke (Lost)|John Locke}} as a recurring gag character.

==Rules==
===Basic rules===
<!-- Putting a Pokémon in the PC when it faints instead of releasing it is NOT a basic rule of the Nuzlocke Challenge. -->

The Nuzlocke Challenge has only two rules that must be followed:
* Any Pokémon that [[Fainting|faints]] is considered dead and must be {{pkmn2|released}}.
* The {{player}} may only catch the first [[wild Pokémon]] encountered in each area, and none else. If the first wild Pokémon encountered faints or flees, there are no second chances. If the first encounter in the area is a [[double battle]], the player is free to choose which of the two wild Pokémon they would like to catch but may only catch one of them. This restriction does not necessarily apply to Pokémon able to be captured during static encounters, nor to [[Shiny]] Pokémon.

===Near-universally used rules===
* The player may not voluntarily reset and reload the game whenever things go wrong. Being able to do so would render all of the other rules pointless.
* The player must nickname all of their Pokémon, for the sake of forming stronger emotional bonds.
* The player may put Pokémon that have fainted in the [[Pokémon Storage System]] permanently rather than releasing them.
* The player may only use Pokémon they have captured themselves, meaning Pokémon acquired through [[Trade|trading]], [[Mystery Gift]]s, etc., are prohibited. As for trading and retrading the same Pokémon (for the purpose of evolving a {{p|Graveler}}, for example), there is no firm consensus.
** As of [http://www.nuzlocke.com/comics/pokemon-hard-mode/page/11/ White: Hard-Mode Episode 3], it is implied that the player can accept Pokémon that are received freely from NPCs.

===Optional rules===
Though the above rules tend to stay consistent with all challengers, many optional variations and amendments to the rules have been created by players to further adjust difficulty. Many other rules exist other than those listed here; challengers adjust their personal rules according to their own preferences. Regardless of the optional rules being used, the run is considered a Nuzlocke Challenge as long as the two basic rules are still in place.

====Increased difficulty====
* The player's [[Starter Pokémon]] must be randomly chosen. A common system is if the last digit of the player's [[Trainer ID number]] is 1-3, the player must choose the Grass-type starter; if it is 4-6, the Fire-type starter; if it is 7-9, the Water-type starter; if it is 0, free choice. Alternatively, use the Trainer ID {{wp|Modulo operation|modulo}} 3 for the same purposes.
* A [[Black out|black out/white out]] is considered to be a "game over," even if there are usable Pokémon left in the [[PC]], and the player must start over.
* The player may only catch the first Pokémon after each [[Gym]] battle instead of in each area.
* The player must use the same number of Pokémon as the opponent uses during a Gym battle or [[rival]] battle.
* The battle style must be changed to "set" in the options menu, meaning the player does not get the opportunity to switch out their Pokémon after an opponent's Pokémon faints.
* The player's [[Starter Pokémon]] must be released after the first wild Pokémon is caught.
* [[Potion]]s and [[Status condition healing item|status-healing items]] may not be used, so the player may only use [[Pokémon Center]]s for healing.
** Or, Pokémon Centers may not be used, meaning only Potions and items may be used for healing.
* The player is limited in their Pokémon Center visits to a certain number per town.
* [[Held item]]s may not be used.
* The number of [[Poké Ball]]s able to be purchased per [[Poké Mart]] is limited to a certain number.
* Poké Marts may not be used; the only items that may be used are those found in the overworld or given to the player by NPCs.
* [[Master Ball]]s may not be used.
* The player may not evolve their captured Pokémon, but evolved Pokémon may still be caught.
* ({{2v2|Black|White|2}} only) The difficulty must be set to [[Key System|Challenge Mode]], which increases the levels of opposing Trainers' Pokémon.
* [[Legendary Pokémon]] may not be used.
* The player may not [[Escape|flee]] from battle.
** Alternatively, the player must flee whenever possible, in order to limit the amount of [[experience]] gained.
* The player may not use Pokémon above a certain [[level]] limit based on the level of the next [[Gym Leader]]/[[Elite Four]]/{{pkmn|Champion}}'s highest leveled Pokémon. What to do with Pokémon in a player's collection that surpass the level limit is up to the player.
* Poké Balls may not be used. Any Pokémon obtained must be either given to the player by an NPC or hatched from an {{pkmn|Egg}}.
* The {{pkmn|Day Care}} may not be used.
* The [[Exp. Share]] may not be used. (This does not apply to {{2v2|Sword|Shield}} or {{2v2|Brilliant Diamond|Shining Pearl}}, where the Exp. Share can't be disabled.)
* Quality-of-life features, such as [[Pokémon-Amie]], the [[DexNav]], or [[Super Training]], may not be used.
* Online resources (walkthroughs, guides, etc.) may not be used.
* Cheating devices (such as [[GameShark]]) may not be used.
* Any type of candy that helps level up the player's Pokémon (such as [[Rare Candy]] or Exp. Candy) may not be used.

====Decreased difficulty====
* The two basic rules are not in effect until the player has gained their first [[Poké Balls]] and thus the ability to catch Pokémon. For example, encounters starting from the {{p|Poochyena}}{{sup/3|RS}}{{sup/6|ORAS}}/{{p|Zigzagoon}}{{sup/3|E}} that the player has to save [[Professor Birch]] from, up to when the player has the ability to catch Pokémon, are not counted. Likewise, in the games where the rival battle is immediately after obtaining the starter Pokémon, the "release or permanently box a Pokémon if it faints" rule is often not enforced at that time.
* Species/Dupes Clause: The "first wild Pokémon in each area" rule does not apply in an area until a species or evolution line is encountered that has not been caught yet. For example, if the player's first encounter in an area is with a {{p|Caterpie}} and they already own a Caterpie, {{p|Metapod}}, or {{p|Butterfree}}, it wouldn't count as their first encounter in that area. This is to allow for increased variety in a player's Pokémon collection.
** A limit may be set on how many times the player can apply the Species/Dupes Clause in an area. If this many duplicate Pokémon are encountered in an area, the Species/Dupes Clause is no longer applied for that area and the player has to settle for the next Pokémon they encounter, regardless of its species.
* The player may have a small number of "second chances" or revives of fallen team members.
* Shiny Clause: Shiny Pokémon do not need to be released if they faint, and can be caught regardless of whether or not an encounter has already been done in the area.
* Each Gym [[Badge]] may act as a checkpoint. If the player gets a game over, they may start over from when they got their previous Gym Badge.
* If the player has no Pokémon that can use a [[field move]] that is required to continue the game, they may catch another Pokémon that can learn the required field move. However, this Pokémon cannot be used in battle for any reason and must be released as soon as it is no longer needed or if the player catches another Pokémon that can use the same field move.
* The "first encounter only" rule is modified for within the [[Safari Zone]]. One encounter may be had for each area, or one encounter may be allowed for the entire Zone.
* Cheating devices (such as [[GameShark]]) may be used.

=="Wonderlocke" Variant==
This is a more unpredictable variant of the Nuzlocke Challenge. In this variant, any Pokémon caught must immediately be traded using [[Wonder Trade]] and the received Pokémon is used instead. Typically, this comes with a level restriction where if the received Pokémon is more than a certain number of levels higher than the original Pokémon, it must be traded again until an appropriate-level Pokémon is received.

==Trivia==
* So far in the original Nuzlocke Series, one starter of each type has been used: {{p|Treecko}} in Hoenn, {{p|Charmander}} in [[Kanto]], and {{p|Oshawott}} in the ongoing [[Unova]] challenge.
* The original Nuzlocke run, through [[Hoenn]], was a failure, due to the wipeout of the entire team and the loss during the Champion battle.

==External links==
*[http://www.nuzlocke.com/ Nuzlocke Comics]
*[https://nuzlockeforums.com/forum/index.php The Nuzlocke Forum]
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