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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.
'''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]].


[[Professor Elm]] and [[Professor Rowan]] are the leading experts in Pokémon Evolution. According to the latter's research, over 90% of all Pokémon are connected to at least one other through Evolution (this is true only if Legendary Pokémon are excluded). Rowan's research in [[Generation IV]] regards whether Evolution is a form of maturity in Pokémon, and looking at the implications of the process on Legendary Pokémon, which at that time did not evolve.
Evolution is not a merely visual change, as Pokémon of a higher evolutionary stage have different (and usually increased) [[stats]], can learn different moves, and sometimes change [[type]]s (although normally at least one of the pre-evolved form's types remains the same). Pokémon may also change [[Ability]] upon evolution.


==Evolution families==
[[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 {{#expr:(1-(
An evolution family is a group of Pokémon who will all, if bred with {{p|Ditto}} or a Pokémon in the same [[Egg Group]], make a Pokémon Egg that will hatch into the same Pokémon, excluding baby Pokémon. This also means that the most basic form has the potential to become any of the rest of the family, although it will ultimately be able to follow only one evolutionary path.
{{PAGESINCAT:Pokémon that are not part of an evolutionary line}}-2)/{{numpkmn}})*100 round 0}}%)<!--subtract 2 due to Pichu and Pikachu-->. Rowan's research focuses on whether Evolution is a form of maturity in Pokémon, and looking at the implications of the process on Legendary Pokémon (which could not evolve in [[Generation IV]], when Rowan debuted).


===Stages of evolution===
==Evolutionary families==
[[File:Piplup family anime.png|thumb|240px|right|Piplup evolution family in the anime]]
[[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 their evolution family. All Pokémon fall into one of four groups: [[baby Pokémon]], unevolved Pokémon, first-evolution Pokémon, and second-evolution Pokémon. These groups are also the basis for the {{Trading Card Game}}'s grouping of {{TCG|Baby Pokémon}}, {{TCG|Basic Pokémon}}, {{TCG|Stage 1 Pokémon}}, and {{TCG|Stage 2 Pokémon}}, respectively.
An evolution family is a group of Pokémon who are all related by evolution. The species at the lowest evolutionary stage in an evolutionary family can ultimately evolve into any member of the evolutionary family.


Due 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.
===Evolutionary 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====
====One-evolution families====
{{main|:category:Pokémon that are part of a two-stage evolutionary line|Pokémon that are part of a two-stage evolutionary line}}
:''See also: [[:Category:Pokémon that are part of a two-stage evolutionary line]]''
By far the most common type of evolution family, these families are based in a Pokémon that will only ever evolve once in its development. About one third of all Pokémon that would later get a baby form were part of this kind of evolution family before their baby form was revealed. An example of this type of evolution family is below.
These are evolutionary families in which a Pokémon can only ever evolve once. These are the most common type of evolutionary family. An example of this type of evolution family is below.


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====Two-evolution families====
====Two-evolution families====
{{main|:category:Pokémon that are part of a three-stage evolutionary line|Pokémon that are part of a three-stage evolutionary line}}
:''See also: [[:Category:Pokémon that are part of a three-stage evolutionary line]]''
Perhaps the most well-known types of evolution families are those that feature two separate evolutionary events in the Pokémon's development. Indeed, this type of evolution family is what all of the [[starter Pokémon]] in the [[core series]] are a part of (excluding the starter {{p|Pikachu}} in {{game|Yellow}}, as {{p|Pichu}} did not yet exist and it could not be evolved into {{p|Raichu}}; and {{p|Eevee}}, which could only be taken by {{ga|Blue}}), as well as all [[pseudo-legendary Pokémon]]. An example of this type of evolution family is below.
These are evolutionary families in which a Pokémon can evolve twice. All [[starter Pokémon]], except {{p|Pikachu}} (in {{game|Yellow}}) and {{p|Eevee}}, have this type of evolutionary family. An example of this type of evolution family is below.


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====Pokémon that do not evolve====
====Pokémon that do not evolve====
{{main|List of Pokémon that are not part of an evolutionary line}}
{{main|List of Pokémon that are not part of an evolutionary line}}
The least common type of evolution family is that in which no evolutionary event takes place, meaning that it is made up of only one member. Many of the Pokémon that have no evolutionary relatives are {{pkmn2|Legendary}} and [[Mythical Pokémon]]. However, there are still 75 other Pokémon that do not evolve.
These are evolutionary families with a single member, which cannot evolve. Many of the Pokémon that have no evolutionary relatives are {{pkmn2|Legendary}} or [[Mythical Pokémon]], although there are some Legendary and Mythical Pokémon that can 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====
====Branched evolution families====
{{main|List of Pokémon with branched evolutions}}
{{main|List of Pokémon with branched evolutions}}
Several families, while also one- and two-evolution families, are also branched evolution families. What this means is that there is a split in the evolutionary line at some point so that even though two Pokémon of the same species evolve the same amount of times, they can become one of two or more entirely different creatures. {{p|Eevee}} is the best-known example of this, evolving eight different ways depending on the method used. An example of this type of evolution family is below.
Several one- and two-evolution families are also branched evolution families. A branched evolution family has a member that can evolve into one of several different Pokémon. {{p|Eevee}} is the most extreme example, having eight different possible evolved forms. 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==
==Methods of evolution==
{{main|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:
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
*leveling up while holding an item
**leveling up when [[friendship]] has reached a high level (220 or greater), sometimes only at certain [[time]]s
*leveling up while knowing a certain move or a move of a certain type
**leveling up while holding an item, sometimes only at certain [[time]]s
*leveling up in a certain location
**leveling up while knowing a certain move or a move of a certain type
*[[trade|trading]] the Pokémon
**leveling up in a certain location
*trading the Pokémon while [[evolution-inducing held item|holding an item]]
**leveling up with a certain Pokémon or Pokémon of a certain type in the party
*trading the {{p|Karrablast|Pokémon}} for specific {{p|Shelmet|Pokémon}}
**leveling up while upside-down
*using an [[evolutionary stone]] on it
**leveling up during certain types of [[weather]]
*leveling up with a certain Pokémon or Pokémon of a certain type in the party
*being [[trade]]d
*leveling up while the [[Nintendo 3DS]] is upside-down
**being traded while [[evolution-inducing held item|holding a specific item]]
*level up or high friendship based on [[Time|time of day]]
**being traded for a specific Pokémon
*level up a {{p|Sliggoo|Pokémon}} during certain types of [[weather]]
*using an [[evolutionary 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, holding an [[Everstone]] prevents a Pokémon from evolving. Surprising a Pokémon via the B Button also prevents evolution, but only for Pokémon that evolve upon gaining a [[level]]. This method is known as an "Evolution cancel".
Some evolutions are dependent on the Pokémon's [[gender]]. For example, only female {{p|Combee}} can evolve into {{p|Vespiquen}}—male Combee cannot evolve at all. Similarly, all {{p|Snorunt}} can evolve into {{p|Glalie}}, but only female Snorunt can evolve into {{p|Froslass}}. On the other hand, male {{p|Burmy}} can only evolve into {{p|Mothim}}, while female Burmy can only evolve into {{p|Wormadam}}.


Pokémon that [[Fainting|faint]] during a {{pkmn|battle}} will evolve at 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 met.
==In the games==
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.


In [[Pokémon FireRed and LeafGreen]], Pokémon whose evolved forms are known in-game but not in its regional [[Pokédex]] will fail to evolve, even if the conditions have been met. For example, {{p|Chansey}} will fail to evolve into {{p|Blissey}}, a Pokémon that was already known, unless the [[National Pokédex]] is obtained.
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. Even if a Pokémon faints in battle, it will still evolve at the end of that battle if it met the requirements to evolve; however, prior to [[Generation VI]], if the player lost the battle, none of their Pokémon could evolve as a result of that battle.


Pokémon that can evolve into more than one Pokémon will usually have the ways in which the evolution is activated being slightly similar, such as having both being initiated by [[evolutionary stone]] or by trading while [[held item|holding an item]]. Closely-related Pokémon, such as {{p|Nidoran♀}} and {{p|Nidoran♂}}, will also have very similar, if not identical, evolution methods.
Holding an [[Everstone]] prevents a Pokémon from evolving by level up or trade. Additionally, the player can prevent a Pokémon from evolving upon leveling up by pressing the B button when it would evolve. In {{game|FireRed and LeafGreen|s}}, if the player does not have the [[National Pokédex]], if a Pokémon in the [[Kanto Pokédex]] meets its evolution conditions but its evolved form is not in the Kanto Pokédex (for example, {{p|Chansey}}'s evolution into {{p|Blissey}}), it will attempt to evolve but fail.


Some Pokémon have different evolutions depending on their gender. For example, only female {{p|Combee}} can evolve into {{p|Vespiquen}}; male Combee cannot evolve at all. Meanwhile, all {{p|Snorunt}} can evolve into {{p|Glalie}}, but female Snorunt have the option of evolving into {{p|Froslass}} instead. This instance occurs in a similar way with {{p|Kirlia}}, albeit with males having split evolution instead.
When a Pokémon evolves, it immediately attempts to learn all moves that the evolved form can learn at its current [[level]]. Additionally, starting in [[Generation VII]], some Pokémon have [[Evolution move]]s, which are moves that Pokémon will always attempt to learn when evolving into that species, regardless of level.


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).


Some Pokémon evolve in other unique ways. If one trades a {{p|Karrablast}} for a {{p|Shelmet}}, they will evolve into {{p|Escavalier}} and {{p|Accelgor}}, respectively, though neither will evolve if one of them holds an [[Everstone]]. When {{p|Inkay}} reaches level 30, the player must hold the [[Nintendo 3DS|3DS]] upside-down for it to evolve into {{p|Malamar}}. Also introduced was a weather-based evolution: {{p|Sliggoo}} will evolve into {{p|Goodra}} beginning at level 50 only if it is [[rain]]ing in the area that the player is in. Finally, {{p|Sylveon}} can only be obtained by leveling up an {{p|Eevee}} that knows any {{type|Fairy}} moves and has at least two hearts of [[Affection]].
However, some Pokémon originally from the [[Generation III]] games can change Ability slot upon evolution. When Abilities were introduced in Generation III, some Pokémon only had one possible Ability, but were given a second Ability in Generation IV. If a Pokémon whose species gained an Ability after Generation III is transferred to a Generation IV or {{gen|V}} game, it will initially retain its original Ability; upon evolving, however, its Ability slot will be recalculated and its Ability may change. When a Pokémon is transferred to Generation VI or [[Generation VII]], however, it will be locked into the appropriate slot for its current 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.


==Animations==
{{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}}
{{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}}
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