Evolution

is the first evolution in the Pokémon franchise when one Pokémon, upon reaching a certain level, using certain stones, learning certain moves, or being traded, evolves into a different kind of Pokémon. In Pokémon Gold, Silver, Crystal, HeartGold and SoulSilver games, it is stated that Professor Elm is an expert on evolution, and discovered that Pikachu evolves from Pichu.
In the anime, during evolution, a Pokémon will become surrounded by a light and slowly change shape. From Pokémon the Series: The Beginning through to Pokémon the Series: Diamond and Pearl, the Pokémon is surrounded by a white light, while in Pokémon the Series: Black & White to Pokémon Journeys: The Series, the Pokémon is surrounded by a golden or blue light. An evolution can also occur through multiple Pokémon of the same species combining. In some occasions, when a Pokémon (such as Ash's Charmander, Serena's Eevee, and Goh's Sobble, or a wild Gossifleur from PJ122) is about to evolve, its outline shines or its body becomes slightly brighter in a blue color.
To some Pokémon, evolution means growing up, while to others, it just refers becoming another species or getting upgraded. However, many of them retain the memories of their life during their pre-evolution form. Evolution in the Pokémon games is more similar to metamorphosis (the process certain bugs undergo to become an adult) than actual evolution (a long process that happens to populations of creatures).
==Tips==
Pokémon gain experience after battling wild Pokémon and Pokémon Trainers. After gathering enough experience points, the Pokémon levels up. When a Pokémon reaches a particular level, it will evolve into its next form (if it has one). There are ways to share experience, such as allow a Pokémon to hold Exp. Share: a hold item that allows the user to earn experience even if it did not participate in the battle.
Evolution can be prevented by simply press the 'B' button on the Game when the Pokémon is attempting to evolve. This is useful as some Pokémon will learn moves that cannot be learnt in a later form or if you want a Pokémon to learn a move earlier than usual. For example, Gabite. If you let Gible evolve into Gabite at level 24 it will learn Dragon Rush at level 49, but if you keep Gible it will learn Dragon Rush at level 37. Sometimes it doesn't matter if you let it evolve or not. The Pokémon can hold an Everstone, which keeps them from evolving, so that you don't have to keep cancelling the evolution every time the Pokémon levels up. Although some Pokémon can evolve more than once (Poliwhirl, Wurmple, Applin etc.) some basic Pokémon just can't evolve, due to undiscovered forms, or if they are really rare (Chatot, Groudon, etc.). There are also Pokémon that can evolve into different things like love, choice, etc. (e.g. Eevee, Poliwhirl, Wurmple, or Kirlia)
==Special conditions==
===Bag items===
Some Pokémon will not evolve unless you use special items, mostly consisting of Evolutionary Stones, which are linked to the Pokémon's type. Here are a list of Pokémon that can evolve by giving them the items.
 List of Pokémon that evolve by using items
Name 	Conditions 	Evolve to
Vulpix 	Fire Stone 	Ninetales
Growlithe 	Fire Stone 	Arcanine
Eevee 	Fire Stone 	Flareon
Pansear 	Fire Stone 	Simisear
Pikachu 	Thunder Stone 	Raichu
Pikachu 	Thunder Stone 	Raichu (Alolan)
Eevee 	Thunder Stone 	Jolteon
Eelektrik 	Thunder Stone 	Eelektross
Charjabug 	Thunder Stone 	Vikavolt
Poliwhirl 	Water Stone 	Poliwrath
Shellder 	Water Stone 	Cloyster
Staryu 	Water Stone 	Starmie
Eevee 	Water Stone 	Vaporeon
Lombre 	Water Stone 	Ludicolo
Panpour 	Water Stone 	Simipour
Gloom 	Leaf Stone 	Vileplume
Weepinbell 	Leaf Stone 	Victreebel
Exeggcute 	Leaf Stone 	Exeggutor
Exeggcute 	Leaf Stone 	Exeggutor (Alolan)
Eevee 	Leaf Stone 	Leafeon
Nuzleaf 	Leaf Stone 	Shiftry
Pansage 	Leaf Stone 	Simisage
Gloom 	Sun Stone 	Bellossom
Sunkern 	Sun Stone 	Sunflora
Cottonee 	Sun Stone 	Whimsicott
Petilil 	Sun Stone 	Lilligant
Helioptile 	Sun Stone 	Heliolisk
Nidorina 	Moon Stone 	Nidoqueen
Nidorino 	Moon Stone 	Nidoking
Clefairy 	Moon Stone 	Clefable
Jigglypuff 	Moon Stone 	Wigglytuff
Skitty 	Moon Stone 	Delcatty
Munna 	Moon Stone 	Musharna
Roselia 	Shiny Stone 	Roserade
Togetic 	Shiny Stone 	Togekiss
Minccino 	Shiny Stone 	Cinccino
Floette 	Shiny Stone 	Florges
Kirlia (♂ - Male) 	Dawn Stone 	Gallade
Snorunt (♀ - Female)	Dawn Stone 	Froslass
Murkrow 	Dusk Stone 	Honchkrow
Misdreavus 	Dusk Stone 	Mismagius
Lampent 	Dusk Stone 	Chandelure
Doublade 	Dusk Stone 	Aegislash
Sandshrew (Alolan) 	Ice Stone 	Sandslash (Alolan)
Vulpix (Alolan) 	Ice Stone 	Ninetales (Alolan)
Eevee 	Ice Stone 	Glaceon
Darumaka (Galarian) 	Ice Stone 	Darmanitan (Galarian)
Applin 	Tart Apple 	Flapple
Applin 	Sweet Apple 	Appletun
Applin 	Syrupy Apple 	Dipplin
Sinistea (Phony) 	Cracked Pot 	Polteageist (Phony)
Sinistea (Antique) 	Chipped Pot 	Polteageist (Antique)
Slowpoke (Galarian) 	Galarica Cuff 	Slowbro (Galarian)
Slowpoke (Galarian) 	Galarica Wreath 	Slowking (Galarian)
Scyther 	Black Augurite 	Kleavor
Poltchageist 	Unremarkable Teacup	Sinistcha
Duraludon 	Metal Alloy 	Archaludon
===Held item evolutions===
Some items are needed for a Pokémon to evolve. If a Pokémon hold the item allowing it to evolve, let it level up once and it will then evolve into the second form.
 List of Pokémon that evolve by holding items
Name 	Conditions 	Evolve to
Gligar 	Held Item: Razor Fang at Night 	Gliscor
Sneasel 	Held Item: Razor Claw at Night 	Weavile
Sneasel (Hisuian)	Held Item: Razor Claw at Day 	Sneasler
Happiny 	Held Item: Oval Stone at Day 	Chansey
Bisharp 	Held Item: Leader's Crest when defeating 3 Bisharp in a group	Kingambit
===Trading and held item evolutions===
A small group of Pokémon refuses to evolve, no matter if you are at the appropriate level to trigger the evolve process, unless you trade them with a friend. Some Pokémon need to have a held item to evolve when trading with a friend. Another group require specific Pokémon to be trade in order to evolve. In Pokémon Legends: Arceus, Pokémon that would evolve by being traded are instead evolved with a Linking Cord. Pokémon that would evolved while being traded and holding a certain item are evolved by being exposed to the item directly without needed to be traded.
 List of Pokémon that evolve by trading
Name 	Conditions 	Evolve to
Kadabra 	None/Linking Cord in Legends: 	Alakazam
Haunter 	None/Linking Cord in Legends: 	Gengar
Machoke 	None/Linking Cord in Legends: 	Machamp
Graveler 	None/Linking Cord in Legends: 	Golem
Graveler (Alolan)	None/Linking Cord in Legends: 	Golem (Alolan)
Boldore 	None/Linking Cord in Legends: 	Gigalith
Gurdurr 	None/Linking Cord in Legends: 	Conkeldurr
Phantump 	None/Linking Cord in Legends: 	Trevenant
Pumpkaboo 	None/Linking Cord in Legends: 	Gourgeist
Onix 	Held Item: Metal Coat 	Steelix
Scyther 	Held Item: Metal Coat 	Scizor
Poliwhirl 	Held Item: King's Rock 	Politoed
Slowpoke 	Held Item: King's Rock 	Slowking
Seadra 	Held Item: Dragon Scale 	Kingdra
Porygon 	Held Item: Upgrade 	Porygon2
Clamperl 	Held Item: Deep Sea Scale 	Gorebyss
Clamperl 	Held Item: Deep Sea Tooth 	Huntail
Electabuzz 	Held Item: Electirizer 	Electivire
Magmar 	Held Item: Magmarizer 	Magmortar
Rhydon 	Held Item: Protector 	Rhyperior
Porygon2 	Held Item: Dubious Disc 	Porygon-Z
Feebas 	Held Item: Prism Scale (Generation V-)	Milotic
Dusclops 	Held Item: Reaper Cloth 	Dusknoir
Shelmet 	Trade for Karrablast 	Accelgor
Karrablast 	Trade for Shelmet 	Escavalier
Spritzee 	Held Item: Sachet 	Aromatisse
Swirlix 	Held Item: Whipped Dream 	Slurpuff
===Gender evolution===
Small groups of Pokémon requires a gender to evolve into the next stage.
 List of Pokémon that evolve by exclusive gender
Name 	Conditions 	Evolve to
Kirlia 	Dawn Stone (♂ - Male) 	Gallade
Burmy 	Level 20, (♀ - Female) 	Wormadam
Burmy 	Level 20, (♂ - Male) 	Mothim
Combee 	Level 25, (♀ - Female) 	Vespiquen
Snorunt 	Dawn Stone , (♀ - Female)	Froslass
Salandit	Level 33, (♀ - Female) 	Salazzle
===Friendship evolutions===
Certain Pokémon, especially baby Pokémon, requires friendship with its trainer and if they are fond enough, they are willing to evolve. Some Pokémon only evolves in a certain time of the day with friendship.
 List of Pokémon that evolve by friendship
Name 	Conditions	Evolve to
Golbat 	None 	Crobat
Chansey 	None 	Blissey
Pichu 	None 	Pikachu
Cleffa 	None 	Clefairy
Igglybuff 	None 	Jigglypuff
Togepi 	None 	Togetic
Azurill 	None 	Marill
Buneary 	None 	Lopunny
Munchlax 	None 	Snorlax
Woobat 	None 	Swoobat
Swadloon 	None 	Leavanny
Type: Null 	None 	Silvally
Eevee 	at Day 	Espeon
Budew 	at Day 	Roselia
Riolu 	at Day 	Lucario
Meowth (Alolan)	At Night 	Persian (Alolan)
Eevee 	At Night 	Umbreon
Chingling 	At Night 	Chimecho
Snom 	At Night 	Frosmoth
===Location-based evolutions===
Special Pokémon evolve by leveling up at a certain area of location.
 List of Pokémon that evolve by exclusive location
Name 	Conditions 	Evolve to
Magneton 	Locations with an Special Magnetic Field(Gen. IV-VII)	Magnezone
Nosepass 	Locations with an Special Magnetic Field(Gen. IV-VII)	Probopass
Charjabug 	Locations with an Special Magnetic Field(Gen. IV-VII)	Vikavolt
Eevee 	Locations with an Moss Rock(Gen. IV-VII) 	Leafeon
Eevee 	Locations with an Ice Rock(Gen. IV-VII) 	Glaceon
Crabrawler	Mount Lanakila 	Crabominable
===Attack-based evolutions===
Certain Pokémon need to know a move to evolve. This method was introduced in Generation IV, starting with Diamond/Pearl/Platinum.
 List of Pokémon that evolve by knowing moves
Name 	Conditions 	Evolve to
Tangela 	Learning Ancient Power	Tangrowth
Yanma 	Learning Ancient Power	Yanmega
Piloswine	Learning Ancient Power	Mamoswine
Bonsly 	Learning Mimic 	Sudowoodo
Mime Jr. 	Learning Mimic 	Mr. Mime
Lickitung	Learning Rollout 	Lickilicky
Aipom 	Learning Double Hit 	Ambipom
Steenee 	Learning Stomp 	Tsareena
Poipole 	Learning Dragon Pulse 	Naganadel
Clobbopus	Learning Taunt 	Grapploct
Primeape 	Learning Rage Fist 	Annihilape
Girafarig	Learning Twin Beam 	Farigiraf
Dunsparce	Learning Hyper Drill 	Dudunsparce
Dipplin 	Learning Dragon Cheer 	Hydrapple
===Time-based evolutions===
The current time of day will sometimes affect evolution. This method was introduced in Generation VI, starting with X/Y/OR/AS.
 List of Pokémon that evolve by time
Name 	Conditions 	Evolve to
Ursaring (Hisui) 	Expose to a Peat Block during a full moon 	Ursaluna
Tyrunt 	Level 39+ during the day. 	Tyrantrum
Amaura 	Level 39+ during the night. 	Aurorus
Rattata (Alolan) 	Level 20+ during the night. 	Raticate (Alolan)
Cubone (Alola) 	Level 28+ during the night. 	Marowak (Alolan)
Yungoos 	Level 20+ during the day. 	Gumshoos
Rockruff 	Level 25+ during the day. 	Lycanroc (Midday)
Rockruff 	Level 25+ during the night. 	Lycanroc (Midnight)
Rockruff 	Level 25+ during the dusk with Own Tempo Ability.	Lycanroc (Dusk)
Fomantis 	Level 25+ during the day. 	Lurantis
Linoone (Galarian)	Level 35+ at night. 	Obstagoon
===Unique evolutions===
Some Pokémon have unique ways of evolving.
 List of Pokémon that evolve by other methods
Name 	Conditions 	Evolve to
Farfetch'd (Galarian)	Get 3 Critical Hits in 1 Battle 	Sirfetch'd
Eevee 	2+ Affection in Pokémon-Amie or Pokémon Refresh/Has high friendship, learn a -type move. 	Sylveon
Wurmple 	Level 7 (Random depending on PV - Personality Value) 	Silcoon
Wurmple 	Level 7 (Random depending on PV - Personality Value) 	Cascoon
Qwilfish 	Use Barb Barrage twenty times in Strong Style 	Overqwil
Stantler 	Use Psyshield Bash twenty times in Agile Style 	Wyrdeer
Tyrogue 	Level 20, Attack stats more than Defense 	Hitmonlee
Tyrogue 	Level 20, Defense stats more than Attack 	Hitmonchan
Tyrogue 	Level 20, Attack stats equal to Defense 	Hitmontop
Feebas 	Maxed out Beauty Condition and then level up (Generation III - IV) 	Milotic
Nincada 	Level 20, with empty Poké Ball and an open slot on your party. 	Shedinja
Mantyke 	Level up with a Remoraid in the party. 	Mantine
Basculin (Hisui) 	Lose at least 294 HP from recoil damage, not counting damage that results in it fainting 	Basculegion
Yamask (Galar) 	Walk under the stone bridge in Dusty Bowl after Yamask has taken at least 49 HP in damage without fainting. 	Runerigus
Pancham 	Level 32+ with a -type in your party. 	Pangoro
Inkay 	Level 30+ while holding the Nintendo 3DS upside down/the Nintendo Switch upside down in handheld mode when disconnecting the Pro Controller by removing the Switch from the docking station.	Malamar
Sliggoo 	Level 50+ during rainy or foggy weather. 	Goodra
Cosmoem 	Level 53+ in Pokémon Sun, Ultra Sun, or Sword. 	Solgaleo
Cosmoem 	Level 53+ in Pokémon Moon, Ultra Moon, or Shield. 	Lunala
Meltan 	Evolve in Pokémon GO once the player has 400 Meltan Candies. 	Melmetal
Toxel 	Level 30+ with Bashful, Bold, Calm, Careful, Gentle, Lonely, Mild, Modest, Quiet, Relaxed, Serious, or Timid Nature. 	Toxtricity (Low Key)
Toxel 	Level 30+ with Adamant, Brave, Docile, Hardy, Hasty, Impish, Jolly, Lax, Naive, Naughty, Rash, Quirky, or Sassy Nature. 	Toxtricity (Amped)
Milcery 	Spin clockwise for 5 seconds during the day, holding a Sweet 	Alcremie ()
Milcery 	Spin counter-clockwise for 5 seconds during the day, holding a Sweet 	Alcremie ()
Milcery 	Spin clockwise for 5 seconds during the night, holding a Sweet 	Alcremie ()
Milcery 	Spin counter-clockwise for 5 seconds during the night, holding a Sweet 	Alcremie ()
Milcery 	Spin clockwise for more than 5 seconds during the day, holding a Sweet 	Alcremie ()
Milcery 	Spin counter-clockwise for more than 5 seconds during the day, holding a Sweet 	Alcremie ()
Milcery 	Spin clockwise for more than 5 seconds during the night, holding a Sweet 	Alcremie ()
Milcery 	Spin counter-clockwise for more than 5 seconds during the night, holding a Sweet 	Alcremie ()
Milcery 	Spin counter-clockwise for more than 10 seconds during the dusk/dawn, holding a Sweet 	Alcremie ()
Kubfu 	Complete the Tower of Darkness 	Urshifu (Single Strike Style)
Kubfu 	Complete the Tower of Waters 	Urshifu (Rapid Strike Style)
===Mega Evolution===
Certain Pokémon will be able to Mega Evolve with the use of a Mega Stone, a held item, if its Trainer has a Key Stone. However, the Pokémon will revert into their non-Mega Evolved form at the end of the battle, or after the Pokémon faints.
==Devolution==
===Primal Reversion===
Primal Reversion is a similar state to Mega Evolution, but the Pokémon devolve to a previous state in the past.
It is a possible game mechanic in Pokémon Omega Ruby and Pokémon Alpha Sapphire, most likely because this mechanic was founded during development of Pokémon Omega Ruby & Alpha Sapphire.
===Other===
Devolution is a form of reverse evolution when a Pokémon reverts to a previous state. The only instance devolution happens in the games is in Pokémon Super Mystery Dungeon, in which the player Pokémon and partner Pokémon evolve and soon devolve three times during the main story, and Pokémon Mystery Dungeon: Gates to Infinity, which includes the Devolve Orb that devolves all enemies in the room.
Devolution is common in the Manga and TCG. It is achieved mainly unnaturally—through experimentation, or Devolution Spray. Though certain Pokémon, such as Isamu's Clefairy and Pikachu are capable of devolving themselves. The TCG also has it that Eeveelutions can revert into Eevee and that Mew has two special attacks named the Devolution Beam and Devo Crush - both of which which devolves the Pokémon hit by the attack. Golurk and Jirachi also possess special attacks which allow them to devolve an opposing Pokémon.
===Anime===
In "Electric Shock Showdown", Misty points out that once Pikachu evolves with the use of the Thunder Stone, Pikachu won't revert.
In "An Epic Defense Force", Luke's Golett seemingly evolves to Golurk in a Movie then devolves back to Golett. This repairs the Golurk Statue, since it turns out to be fictitious.
Another instance of the non-existence of devolution, is when Bonnie requested Ash's Frogadier to devolve back to Froakie, Clemont said that it would be impossible.
In “The Gates of Warp!” and Showdown at the Gates of Warp!”, a number of Pokemon have devoted to their earlier forms, then into eggs, including Ash’s Pikachu, but when Palkia and Dialga stopped fighting, the Pokemon returned to their normal forms.
==Trivia==
*There are eight Pokémon that can evolve into two different Pokémon, but only two that evolve into more: Tyrogue (three) and Eevee (eight).
*As of Generation VIII, there are 87 Pokémon that do not evolve in any way. This is discounting Legendary Pokémon, Mythical Pokémon, and form changes such as Mega Evolution.
*In "Dream a Little Dream from Me!", there is a group of Pokémon who evolved and devolved unnaturally, one actually missing its second evolved form.
*In Final Rivals!, an evolution has occurred through multiple Pokémon of the same species combining, which was shown by Ash's Meltan and its horde.
*Larvesta evolves at the highest level out of all unevolved Pokémon so far (level 59).
*Zweilous evolves at the highest level out of any evolved Pokémon so far (level 64).
*Porygon is currently the only Pokémon to be able to evolve at level 1 into both its evolutions, as they do not need a certain level to evolve.
*Generation VII was the first generation to introduce Legendary and Mythical Pokémon capable of evolution.
*Poipole is the only Ultra Beast that can evolve.
*81.51% of all Pokémon are part of an evolutionary line of either a two-stage or a three-stage line.
*18.49% of all Pokémon are not part of an evolutionary line.
==Gallery==
===Anime===
Roy Wattrel evolves.png
Liko Hatenna evolves.png
*