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'''Evolution''' (Japanese: '''{{tt|進化|しんか}}''' ''evolution'') is a process in which a {{OBP|Pokémon|species}} changes into a different species of Pokémon.
==Overview==With respect to real-world phenomena, Pokémon Evolution is more similar to {{wp|metamorphosis}} than {{wp|evolution}}. Evolution is mostly independent from the {{wp|aging}} process, instead being triggered by external factors, such as gaining [[experience]] in battle or being exposed to certain [[item]]s.
Evolution is not a merely visual change, as Pokémon of a higher evolutionary stage have different (and usually more powerful) [[base stats]] than their predecessors, may have different [[move]]s that can be learned, and sometimes change their [[type]]s, though usually at least one of the types of the previous form is preserved. Other statistics, such as [[Nature]] and {{EV}}s, as well as {{shiny|shininess}}, are preserved. The Pokémon's [[Ability]] slot also remains the same, though depending on species, the actual Ability may change. With respect to real-world phenomena, Pokémon Evolution is more similar to {{wp|metamorphosis}} than {{wp|evolution}}. Evolution also appears to be a mostly independent phenomena from the {{wp|aging}} process for most species, though [[Baby Pokémon]] need to evolve to their next stage in order to [[Pokémon Breeding|breed]].
[[ProfessorEvolution Elm]]is andnot [[Professora Rowan]]merely arevisual thechange, leading experts inas Pokémon Evolution. According to the latter's research, over 90% of alla Pokémonhigher areevolutionary connectedstage tohave at least one other through Evolutiondifferent (thisand isusually trueincreased) only[[stats]], ifcan Legendarylearn Pokémondifferent aremoves, excluded).and Rowan'ssometimes research inchange [[Generation IVtype]]s regards(although whethernormally Evolutionat isleast a formone of maturitythe inpre-evolved Pokémon,form's andtypes looking atremains the implications of the process on Legendarysame). Pokémon, whichmay atalso thatchange time[[Ability]] did notupon evolveevolution.
==[[Professor Elm]] and [[Professor Rowan]] are the leading experts in Pokémon Evolution. According to Elm's research, over 90% of all Pokémon are connected to at least one other through Evolution (currently the actual percentage is families=={{#expr:(1-(
An{{PAGESINCAT:Pokémon evolutionthat familyare is anot grouppart of Pokémonan who will all, if bred withevolutionary line}}-2)/{{p|Dittonumpkmn}})*100 orround a0}}%)<!--subtract Pokémon2 indue theto samePichu [[Eggand Group]],Pikachu-->. makeRowan's aresearch Pokémonfocuses Eggon thatwhether willEvolution hatchis intoa theform sameof Pokémon,maturity excluding babyin Pokémon., Thisand alsolooking means thatat the most basic form has the potential to become anyimplications of the restprocess ofon theLegendary family,Pokémon although(which itcould willnot ultimatelyevolve bein able[[Generation toIV]], followwhen only one evolutionaryRowan pathdebuted).
===StagesEvolutionary of evolution=families==
[[File:Piplup family anime.png|thumb|240px|right|Piplup evolution family in the anime]]
Pokémon can be divided into different evolutionary stages, based on where they appear in theirAn evolution family. Allis Pokémona fall into onegroup of four groups: [[baby Pokémon]], unevolvedwho Pokémon,are first-evolutionall Pokémon,related andby second-evolution Pokémon. TheseThe groupsspecies are alsoat the basislowest forevolutionary thestage {{Tradingin Cardan Game}}'sevolutionary groupingfamily ofcan {{TCG|Babyultimately Pokémon}},evolve {{TCG|Basicinto Pokémon}},any {{TCG|Stagemember 1of Pokémon}},the andevolutionary {{TCG|Stage 2 Pokémon}}, respectivelyfamily.
Due===Evolutionary to the fact that no evolution family contains both a baby Pokémon and a second-evolution Pokémon, many regard baby Pokémon as the most basic form, while moving their evolved counterparts one level higher. For example, originally, {{p|Pikachu}} was regarded as an unevolved Pokémon, however, with the release of {{p|Pichu}} in [[Generation II]], many now consider it to be more on par with Pokémon like {{p|Charmeleon}}, though its TCG classification remains the same.stages===
Pokémon evolutionary families have anywhere between one and three stages. In a one-stage family, there is only a single Pokémon that cannot evolve. In a two-stage family, any member of the family can evolve at most once, from the unevolved form into one of the evolved forms. In a three-stage family, at least one of the evolved forms can evolve once again.
In the [[Pokémon Trading Card Game]], Pokémon are divided into four different categories: {{TCG|Baby Pokémon}}, {{TCG|Basic Pokémon}}, {{TCG|Stage 1 Pokémon}}, and {{TCG|Stage 2 Pokémon}}. Pre-evolved forms introduced in a later generation than their evolved form are classified as Baby Pokémon, so that the evolution stages of their evolved forms are not disrupted.
====One-evolution families====
{{main|:category''See also:Pokémon that are part of a two-stage evolutionary line|[[:Category:Pokémon that are part of a two-stage evolutionary line}}]]''
ByThese far the most common type of evolution family,are theseevolutionary families arein based inwhich a Pokémon that willcan only ever evolve once in its development. AboutThese oneare thirdthe ofmost allcommon Pokémon that would later get a baby form were parttype of this kind of evolutionevolutionary family before their baby form was revealed. An example of this type of evolution family is below.
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====Two-evolution families====
{{main|:category''See also:Pokémon that are part of a three-stage evolutionary line|[[:Category:Pokémon that are part of a three-stage evolutionary line}}]]''
Perhaps the most well-known types of evolution familiesThese are those that feature two separate evolutionary eventsfamilies in thewhich a Pokémon's development.can Indeed,evolve thistwice. type of evolution family is what all of theAll [[starter Pokémon]], in the [[core series]] are a part of (excluding the starterexcept {{p|Pikachu}} (in {{game|Yellow}}, as {{p|Pichu}} did not yet exist and it could not be evolved into {{p|Raichu}};) and {{p|Eevee}}, whichhave couldthis onlytype beof takenevolutionary by {{ga|Blue}}), as well as all [[pseudo-legendary Pokémon]]family. An example of this type of evolution family is below.
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====Pokémon that do not evolve====
{{main|List of Pokémon that are not part of an evolutionary line}}
TheThese leastare commonevolutionary typefamilies ofwith evolutiona familysingle is that inmember, which nocannot evolutionary event takes place, meaning that it is made up of only one memberevolve. Many of the Pokémon that have no evolutionary relatives are {{pkmn2|Legendary}} andor [[Mythical Pokémon]]. However, although there are stillsome 75Legendary otherand Mythical Pokémon that do notcan evolve.
Not belonging to an evolutionary family is not indicative of strength, or a lack thereof. Some Pokémon, such as {{p|Heracross}} and {{p|Skarmory}}, are comparable to fully evolved Pokémon while others, like {{p|Delibird}} and {{p|Luvdisc}}, are more comparable to unevolved Pokémon. Often this indicates a Pokémon's possibility to be eligible for future [[List of Pokémon with cross-generational evolutions|new evolutions]] or [[baby Pokémon|pre-evolutions]].
====Branched evolution families====
{{main|List of Pokémon with branched evolutions}}
Several families, while also one- and two-evolution families, are also branched evolution families. WhatA thisbranched meansevolution isfamily that there ishas a split in the evolutionary line at some point somember that even though two Pokémon of the same speciescan evolve the same amount of times, they can becomeinto one of two or more entirelyseveral different creaturesPokémon. {{p|Eevee}} is the best-knownmost extreme example of this, evolvinghaving eight different ways depending on thepossible methodevolved usedforms. An example of this type of evolution family is below.
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Currently no non-glitch instances are known where two different Pokémon species can evolve into the same Pokémon.
==Methods of evolution==
{{main|Methods of evolution}}
The various triggers for a Pokémon's evolution are almost as varied as the Pokémon themselves, and some Pokémon have a unique evolution method. The most common of them is Evolution by leveling up at or above a certain level. Other methods include the following:
*leveling up when [[friendship]] has reached a high level (220 or greater)
**leveling up whilewhen holding[[friendship]] anhas itemreached a high level (220 or greater), sometimes only at certain [[time]]s
**leveling up while knowingholding aan certain move or aitem, movesometimes ofonly aat certain type[[time]]s
**leveling up inwhile knowing a certain move or a move of a certain locationtype
*[[trade|trading]]*leveling theup Pokémonin a certain location
*trading*leveling theup with a certain Pokémon whileor [[evolution-inducingPokémon heldof item|holdinga ancertain type in the item]]party
*trading*leveling theup {{p|Karrablast|Pokémon}}while for specific {{p|Shelmet|Pokémon}}upside-down
*using*leveling anup during certain types of [[evolutionary stoneweather]] on it
*levelingbeing up with a certain Pokémon or Pokémon of a certain type in the party[[trade]]d
*leveling*being uptraded while the [[Nintendoevolution-inducing 3DS]]held isitem|holding upside-downa specific item]]
*level*being uptraded orfor higha friendshipspecific based on [[Time|time of day]]Pokémon
*levelusing up a {{p|Sliggoo|Pokémon}} during certain types ofan [[weatherevolutionary stone]]
*being fed 400 Meltan [[Candy]] in [[Pokémon GO]]
All evolutions via leveling up take place at the end of a {{pkmn|battle}}, or when a Pokémon is given a [[Rare Candy]]. Each Pokémon may evolve only once per battle.
Additionally,Some holdingevolutions anare dependent on the Pokémon's [[Everstonegender]]. preventsFor aexample, Pokémononly fromfemale evolving.{{p|Combee}} Surprisingcan aevolve Pokémoninto via{{p|Vespiquen}}—male theCombee Bcannot Buttonevolve alsoat preventsall. evolutionSimilarly, all {{p|Snorunt}} can evolve into {{p|Glalie}}, but only forfemale PokémonSnorunt thatcan evolve uponinto gaining{{p|Froslass}}. aOn [[level]].the Thisother methodhand, ismale known{{p|Burmy}} ascan anonly evolve into {{p|Mothim}}, while female Burmy can only evolve "Evolutioninto cancel"{{p|Wormadam}}.
Pokémon that [[Fainting|faint]] during a {{pkmn|battle}} will evolve at==In the end of that battle if its requirements have been met. However, before [[Generation VI]], losing a battle would make Pokémon not evolve even if the conditions have been
When a Pokémon evolves, it becomes a new species of Pokémon. This new species has a different Pokédex number and [[base stat]]s, and may be a different [[type]], learn different moves, and have a different [[Ability]]. The Pokémon's personal properties, however, such as [[Nature]] and {{Shiny|Shininess}}, remain.
InAll [[Pokémonevolutions FireRedvia andleveling LeafGreen]],up Pokémontake whoseplace evolvedat formsthe areend knownof in-gamea but{{pkmn|battle}}, notor inwhen itsa regionalPokémon is given a [[PokédexRare Candy]]. willEach failPokémon tomay evolve, evenonly ifonce theper conditionsbattle. haveEven beenif met.a ForPokémon examplefaints in battle, {{p|Chansey}}it will fail tostill evolve intoat {{p|Blissey}},the aend Pokémonof that wasbattle alreadyif known,it unlessmet the requirements to evolve; however, prior to [[NationalGeneration PokédexVI]], isif the player lost the battle, none of their Pokémon could evolve as a result of that obtainedbattle.
Holding an [[Everstone]] prevents a Pokémon thatfrom canevolving evolveby intolevel moreup or trade. Additionally, the player can thanprevent onea Pokémon willfrom usuallyevolving haveupon theleveling waysup inby whichpressing the evolutionB isbutton activatedwhen beingit slightlywould similarevolve. In {{game|FireRed and LeafGreen|s}}, suchif asthe havingplayer bothdoes beingnot initiatedhave bythe [[evolutionaryNational stonePokédex]], orif bya tradingPokémon whilein the [[heldKanto item|holding an itemPokédex]]. Closely-relatedmeets Pokémon,its suchevolution asconditions but its evolved form is not in the Kanto Pokédex (for example, {{p|Nidoran♀Chansey}}'s andevolution into {{p|Nidoran♂Blissey}}), it will alsoattempt haveto veryevolve similar, if not identical, evolutionbut methodsfail.
SomeWhen a Pokémon haveevolves, differentit evolutionsimmediately dependingattempts onto theirlearn gender.all Formoves example,that onlythe femaleevolved {{p|Combee}}form can evolvelearn intoat {{p|Vespiquen}};its malecurrent Combee cannot evolve at all[[level]]. MeanwhileAdditionally, allstarting {{p|Snorunt}}in can[[Generation evolve into {{p|Glalie}}VII]], butsome female SnoruntPokémon have the[[Evolution optionmove]]s, ofwhich evolvingare intomoves {{p|Froslass}}that instead.Pokémon Thiswill instancealways occursattempt into alearn similarwhen wayevolving withinto {{p|Kirlia}}that species, albeitregardless with males having split evolutionof insteadlevel.
Also, there have been situations in which the current party must be configured in a specific manner for some Pokémon to evolve. So far, only three Pokémon need to have these special requirements. {{p|Mantyke}} will evolve into {{p|Mantine}} if leveled up with a {{p|Remoraid}} in the player's party. {{p|Nincada}} will evolve into {{p|Ninjask}} when it reaches level 20. However, if there happens to be an empty space in the player's party (and a spare {{i|Poké Ball}} in Generation IV onward), a {{p|Shedinja}} will also appear in the party. {{p|Pancham}} evolves into {{p|Pangoro}} if its level is 32 or higher and there is a Dark-type Pokémon in the player's party.===Abilities===
Normally, a Pokémon will retain its Ability slot upon evolution (i.e. if it had its species second Ability before evolving, it will still have its species second Ability after evolving).
SomeHowever, some Pokémon evolveoriginally infrom otherthe unique[[Generation ways.III]] Ifgames onecan tradeschange aAbility {{p|Karrablast}}slot forupon aevolution. {{p|Shelmet}},When theyAbilities willwere evolveintroduced intoin {{p|Escavalier}}Generation and {{p|Accelgor}}III, respectively,some thoughPokémon neitheronly will evolve ifhad one ofpossible themAbility, holdsbut anwere [[Everstone]].given Whena {{p|Inkay}}second reachesAbility levelin 30,Generation theIV. playerIf musta holdPokémon thewhose [[Nintendospecies 3DS|3DS]]gained upside-downan forAbility itafter toGeneration evolveIII intois {{p|Malamar}}.transferred Alsoto introduceda wasGeneration aIV weather-based evolution:or {{pgen|SliggooV}} game, it will evolveinitially intoretain {{p|Goodra}}its beginningoriginal atAbility; levelupon 50evolving, onlyhowever, ifits itAbility isslot [[rain]]ingwill inbe therecalculated areaand thatits theAbility playermay is inchange. Finally,When {{p|Sylveon}}a canPokémon onlyis betransferred obtainedto byGeneration levelingVI upor an[[Generation {{p|Eevee}}VII]], thathowever, knowsit anywill {{type|Fairy}}be moveslocked andinto hasthe atappropriate leastslot twofor heartsits ofcurrent [[Affection]]Ability.
In [[Pokémon Sun and Moon|Pokémon Sun, Moon]], [[Pokémon Ultra Sun and Ultra Moon|Ultra Sun, and Ultra Moon]], [[regional variant|Alolan Pokémon]] and Pokémon that evolve into Alolan Pokémon have a different theme and a different colored background during evolution.===Animations===
In [[Pokémon Sun and Moon|Pokémon Sun, Moon]], [[Pokémon Ultra Sun and Ultra Moon|Ultra Sun, and Ultra Moon]], evolution into an [[regional variant|Alola Form]] has a different theme and a different colored background during evolution.
{{incomplete|section|Needs Let's Go Pikachu/Eevee, Console games<!--Stadium from using items in Oak's Lab, Colo and XD-->, Gen V should not be a crop}}
{| class="roundy" style="margin:auto; text-align:center; background:#{{bulba color light}}; border: 3px solid #{{bulba color dark}}" cellpadding="5" cellspacing="3"
! style="background:#{{alola color}}; {{roundybottom|10px}}" | {{color2|FFF|Pokémon Sun and Moon|SM}}{{color2|FFF|Pokémon Ultra Sun and Ultra Moon|USUM}}
! style="background:#{{alola color}}; color:#fff; {{roundybottom|10px}}" | {{color2|FFF|Pokémon Sun and Moon|SM}}{{color2|FFF|Pokémon Ultra Sun and Ultra Moon|USUM}}<br><small>({{color2|fff|Regional variant|AlolanAlola PokémonForms}})</small>
Each evolutionary family has their own kind of Candy. Candy can be obtained by catching or hatching Pokémon of that evolutionary family, or by walking with a Pokémon of that evolutionary family as a [[Buddy Pokémon]]. The player can also obtain 1 Candy for its evolutionary family by permanently transferring it to [[Professor Willow]].
In Pokémon GO, species that require a [[evolution-inducing held item|held item]] (except {{p|Feebas}} and {{p|Clamperl}}) or a [[Sun Stone|Sun]], [[Shiny Stone|Shiny]] or [[Dusk Stone]] to evolve in the core series also require an item to be spent in addition to Candy. For evolutions introduced in Generation II, the item required is the same as in the core series; for evolutions introduced in Generation IV, a [[Sinnoh Stone]] is required instead.
Normally, {{p|Eevee}} evolves into {{p|Vaporeon}}, {{p|Jolteon}}, or {{p|Flareon}} at random. If Eevee is the current [[Buddy Pokémon]], and has walked at least 10&nbsp;km with the player and obtained at least two Candies, it will evolve into {{p|Espeon}} in day mode or {{p|Umbreon}} in night mode. However, if Eevee is [[nickname]]d after one of the [[Eevee brothers]] (for Vaporeon, Jolteon, or Flareon) or the [[Kimono Girl]]s in the anime (for Espeon and Umbreon), it will be guaranteed to evolve into the corresponding evolution, although this can only be performed once for each nickname.