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Evolution is the first evolution in the Pokémon franchise when one Pokémon, upon reaching a certain level, using a certain stone, learning a certain move, 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. In the Original, Advanced, and Diamond & Pearl series, the Pokémon is surrounded by a white light, while in the Best Wishes and XY series, the Pokémon is surrounded by a golden or blue light.
To some Pokémon, evolution means growing up, while to others, it just refers becoming another species or getting upgraded. However, many of them retain memories during their pre-evolution form.
Normal Evolution tricks
Pokémon gain experience after battling wild Pokémon and Pokémon Trainers. The more experience a Pokémon gains, the more it levels up. When a Pokémon reaches a particular level, it will evolve into its next form (if it has one). This is very helpful to most Trainers who want their Pokémon to become stronger.
There are ways to share experience, such as allow a Pokémon you wish it to evolve to hold Exp. Share. It is a hold item that allows the user to earn experience even if it did not participate in the battle. This is a convenient tool if you want to level up a new or low-level Pokémon.
You can prevent evolution 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. However, if your Pokémon has evolved, it might not evolve again (Raticate, Linoone, etc.) Although some Pokémon can evolve more than once (Poliwhirl, Cascoon, 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. For example, Eevee, Poliwhirl, Wurmple, or Kirlia.
Special Condition Evolutions
Some Pokémon will not evolve unless you use a special stone called an Evolution Stone. These special Items are linked to the Pokémon's type. Here are a list of Pokémon that can evolve by giving them the stones.
|List of Pokémon that Evolve by Evolution Stones|
|Kirlia (♂ - Male)||Dawn Stone||Gallade|
|Snorunt (♀ - Female)||Froslass|
|Sandshrew (Alolan)||Ice Stone||Sandslash (Alolan)|
|Vulpix (Alolan)||Ninetales (Alolan)|
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 Attached Items|
|Gligar||Held Item: Razor Fang at Night||Gliscor|
|Sneasel||Held Item: Razor Claw at Night||Weavile|
|Happiny||Held Item: Oval Stone at Day||Chansey|
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.
|List of Pokémon that Evolve by Trading|
|Graveler (Alolan)||Golem (Alolan)|
|Onix||Held Item: Metal Coat||Steelix|
|Poliwhirl||Held Item: King's Rock||Politoed|
|Seadra||Held Item: Dragon Scale||Kingdra|
|Porygon||Held Item: Up-Grade||Porygon2|
|Clamperl||Held Item: Deepseascale||Gorebyss|
|Clamperl||Held Item: Deepseatooth||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 with Karrablast||Accelgor|
|Karrablast||Trade with Shelmet||Escavalier|
|Spritzee||Held Item: Sachet||Aromatisse|
|Swirlix||Held Item: Whipped Dream||Slurpuff|
Small groups of Pokémon requires a gender to evolve into the next stage.
|List of Pokémon that Evolve by Gender|
|Burmy||Level 20, (♀ - Female)||Wormadam|
|Level 20, (♂ - Male)||Mothim|
|Combee||Level 25, (♀ - Female)||Vespiquen|
|Salandit||Level 33, (♀ - Female)||Salazzle|
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|
|Meowth (Alolan)||Persian (Alolan)|
Location Based Evolutions
Special Pokémon evolve at a certain area of location.
|List of Pokémon that Evolve by Locations|
|Magneton||Mt. Coronet (Generation IV), Chargestone Cave (Generation V), Route 13 (Generation VI), Vast Poni Canyon (Generation VII)||Magnezone|
|Eevee||Moss Rock at Eterna Forest (Generation IV), Moss Rock at Pinwheel Forest (Generation V), Route 20 (Generation VI), Moss Rock at Lush Jungle (Generation VII)||Leafeon|
|Ice Rock at Route 217 (Generation IV), Ice Rock at Twist Mountain (Generation V), Frost Cavern (Generation VI), Ice Rock at Mount Lanakila (Generation VII)||Glaceon|
|Charjabug||Vast Poni Canyon||Vikavolt|
|Crabrawler||atop 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 Learning Moves|
|Mime Jr.||Mr. Mime|
|Aipom||learning Double Hit||Ambipom|
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|
|Tyrunt||Level 39+ during the day.||Tyrantrum|
|Amaura||Level 39+ during the night.||Aurorus|
|Rattata (Alolan)||Level 20+ during the night.||Raticate (Alolan)|
|Cubone||Level 28+ during the night.||Marowak (Alolan)|
|Yungoos||Level 20+ during the day.||Gumshoos|
|Rockruff||Level 25+ during the day.||Lycanroc (Sun)|
|Level 25+ during the night.||Lycanroc (Moon)|
|Fomantis||Level 34+ during the day.||Lurantis|
Some Pokémon have certain type of unique way of evolve.
|List of Pokémon that Evolve by Unique Way|
|Eevee||2+ Affection in Pokémon-Amie, learn a -type move.||Sylveon|
|Wurmple||Level 7 (Random depending on PV - Personality Value)||Silcoon|
|Tyrogue||Level 20, Attack stats more than Defense||Hitmonlee|
|Level 20, Defense stats more than Attack||Hitmonchan|
|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||A Remoraid in your party and then level up.||Mantine|
|Pancham||Level 32+ with a -type in your party.||Pangoro|
|Inkay||Level 30+ while holding the Nintendo 3DS upside down.||Malamar|
|Sliggoo||Level 50+ in the rain.||Goodra|
|Cosmoem||Level 53+ in Pokémon Sun.||Solgaleo|
|Level 53+ in Pokémon Moon.||Lunala|
Certain Pokémon will be able to evolve into a Mega form, the final form for one-evolution families and second/true final form for two-evolution families with the use of a Mega Stone, a held object. However this evolution will devolve back into their previous form at the end of the battle.
|List of Pokémon with Bond Phenomenon|
|Greninja (Battle Bond)||after defeating a Pokémon||Ash-Greninja|
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 & Alpha Sapphire, most likely because this mechanic was founded during development of Pokémon Omega Ruby & Alpha Sapphire.
Devolution is a form of reverse evolution when a Pokemon reverts to a previous state. Devolution does not exist in the games but is common in the Manga and TCG. Devolution is achieved mainly unnaturally - through experimentation, or Devolution Spray. Though certain Pokemon, 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 Pokemon hit by the attack. Golurk and Jirachi also possess special attacks which allow them to devolve an opposing Pokemon.
In An Epic Defense Force, Luke's Golett seemingly evolves to Golurk in a Movie then Devolves back to Golett, repairing the Golurk Statue, as 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.
- There are eight Pokémon that can evolve into two different Pokémon, but only two that evolve into more: Tyrogue and Eevee.
- As of Generation VI, there are sixty Pokémon that do not evolve in anyway. This is discounting the fifty-one Legendary Pokémon.
- 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.