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{{incomplete|Super Mystery Dungeon}}
[[File:Slowbro losing Shellder.png|thumb|200px|Slowbro losing Shellder]]
'''Devolution''' (Japanese: '''{{tt|退化|たいか}}''' ''degeneration'') is the process by which an [[Evolution|evolved]] {{OBP|Pokémon|species}} reverts to its previous form. This process is much less common than evolution due to being impossible within the [[core series]] {{pkmn|games}}. In most media in which it exists, devolution is often instigated through artificial means, such as sprays or genetic engineering.


[[File:DevolutionSprayDragonsExalted113.jpg|thumb|200px|{{TCG ID|Base Set|Devolution Spray|72}}, one of the few methods of inducing devolution in the TCG]]
==In the core series games==
'''Devolution''' (Japanese: '''退化''' ''degeneration'') is the process of an [[Evolution|evolved]] {{OBP|Pokémon|species}} reverting to its previous form. This is not nearly as well-known among the fandom as evolution is, due to devolution being impossible within the {{pkmn|games}} and {{pkmn|anime}}. In most media in which it exists, devolution is not nearly as commonplace as evolution, and is generally brought about mainly through artificial means, such as sprays or genetic engineering.
[[File:Slowking losing Shellder.png|left|thumb|200px|Slowking losing Shellder]]
While devolution is not possible within the [[core series]] games as a mechanic, the notion is referred to by {{p|Slowbro}}'s numerous [[Pokédex]] entries. Said entries claim that if the {{p|Shellder}} falls off, the Slowbro turns back into a Slowpoke. It is said that if {{p|Slowking}} loses its Shellder, it forgets everything it has learned.<ref>[http://www.pokemon.jp/special/yadon_paradise/illustrated/ 絵で見るヤドンずかん|  ヤドンパラダイス|ポケモンだいすきクラブ]</ref>


==In the games==
A similar situation applies to {{p|Exeggutor}}, as it is stated in its Pokédex entries that if one of its heads were to fall off, that head would become an {{p|Exeggcute}}.
[[File:Slowking losing Shellder.png|left|thumb|250px|Slowking losing Shellder]]
[[File:Slowbro losing Shellder.png|thumb|200px|Slowbro losing Shellder]]
While devolution is not possible within the games, the notion is referred to by {{p|Slowbro}}'s numerous [[Pokédex]] entries. Said entries claim that if the {{p|Shellder}} falls off, the Slowbro turns back into a Slowpoke. It is said that if {{p|Slowking}} loses its Shellder, it forgets everything it has learned.<ref>[http://www.pokemon.jp/special/yadon_paradise/illustrated/ 絵で見るヤドンずかん|  ヤドンパラダイス|ポケモンだいすきクラブ]</ref>


A similar situation applies to {{p|Exeggutor}}, as it is stated in its Pokédex entries that if one of its heads were to fall off, it would become an {{p|Exeggcute}}.
{{p|Silvally}}, a Pokémon who had previously gone by the name ''[[Beast killer project|Type: Full]]'' were given control helmets to prevent its {{a|RKS System}} from functioning. This had caused the Pokémon to be renamed to {{p|Type: Null}}, essentially devolving it into an inferior species. Type: Null, both in lore and gameplay, can evolve back into Silvally.


However, no Pokémon can devolve in any Pokémon game, with the exception of [[Pokémon Mystery Dungeon: Gates to Infinity]], which introduced the Devolve Orb, a [[Wonder Orb]] that devolves all enemies in the room. Pokémon cards can devolve in {{cat|Pokémon Trading Card Game video games}} which contain cards that can cause devolution.
In {{p|Melmetal}}'s Pokédex entry for [[Pokémon Sword and Shield|Pokémon Sword]], it is stated that, at the end of a Melmetal's lifespan, its leftover shards will return to being {{p|Meltan}}.
{{-}}
{{-}}
==In the spin-off games==
===Pokémon Mystery Dungeon===
The only Pokémon games in which devolution is possible are games from the [[Pokémon Mystery Dungeon series]] games of the [[Nintendo 3DS]].
In [[Pokémon Mystery Dungeon: Gates to Infinity]], the Devolve Orb is a [[Wonder Orb]] that devolves all enemies in the room.
{{spoilers}}
In [[Pokémon Super Mystery Dungeon]], the player and their partner evolve and later devolve three times during the game's main story, thanks to the [[Harmony Scarf|Harmony Scarves]] they wear.
{{endspoilers}}
===Pokémon Trading Card Game===
Pokémon cards can devolve in {{cat|Pokémon Trading Card Game video games}}, which contain cards that can cause devolution.
===Pokémon UNITE===
The opening cutscene for [[Pokémon UNITE]] shows {{p|Talonflame}}, {{p|Slowbro}}, {{p|Greninja}}, {{p|Cinderace}}, and {{p|Garchomp}} devolving into their base forms of {{p|Fletchling}}, {{p|Slowpoke}}, {{p|Froakie}}, {{p|Scorbunny}}, and {{p|Gible}}, respectively. This suggests that experienced Pokémon that participate in Unite Battles are devolved to their base forms inside the stadium in order to evolve again during the game. However, Pokémon with {{pkmn2|baby}} forms, such as {{p|Pikachu}} and {{p|Mr. Mime}}, do not devolve to their baby stages.
In the Practice Area mode, if the player uses the Reset [[Level]] function in the Practice Options menu to return a Pokémon to [[Level]] 1, that Pokémon will devolve back into their base form. Just like [[evolution]], Pokémon are {{UNITE|condition|invincible}} while devolving.


==In the anime==
==In the anime==
In the [[Pokémon anime]], there has never been an instance of devolution at all. Moreover, {{an|Brock}} explicitly states in ''[[EP014|Electric Shock Showdown]]'' that evolution cannot be reversed, effectively confirming the nonexistence of devolution within the anime. This was reconfirmed in ''[[XY052|A Stealthy Challenge!]]'', where {{an|Bonnie}} asked {{TP|Ash|Frogadier}} to devolve into {{p|Froakie}} so she could see it evolve again, but {{an|Clemont}} explained that it doesn't work that way.
[[File:Devolution anime.png|thumb|250px|{{TP|Jessie|Wobbuffet}} devolving in the {{pkmn|anime}}]]
In the [[Pokémon anime]], the subject of devolution has rarely been brought up. {{an|Misty}} explicitly states in ''[[EP014|Electric Shock Showdown]]'' that evolution cannot be reversed, effectively confirming the nonexistence of devolution within the anime. This was reconfirmed in ''[[XY052|A Stealthy Challenge!]]'', where {{an|Bonnie}} asked {{AP|Frogadier}} to devolve into {{p|Froakie}} so she could see it evolve again, but {{an|Clemont}} explained that it doesn't work that way.
 
In ''[[XY098|Dream a Little Dream from Me!]]'', [[Ash's Pikachu]] had a nightmare featuring Frogadier having devolved into Froakie. [[Clemont's Bunnelby]], which appeared as a {{p|Diggersby}} in the same nightmare, also devolved back into its first stage later in the dream.
 
The first known instance of a real devolution in the anime occurred when {{an|Faba}} fitted {{TP|Gladion|Silvally}} with a restraining mask, thereby turning it into a {{p|Type: Null}}.
 
In ''[[JN089|The Gates of Warp!]]'', Pokémon in an {{pkmn|multiverse|alternate world}} version of [[Sinnoh]] devolved due to {{OBP|Dialga|recurring}} and {{OBP|Palkia|recurring}}'s battle, with most of them eventually reverting all the way into {{pkmn|Egg}}s. In ''[[JN090|Showdown at the Gates of Warp!]]'', this battle was revealed to have been orchestrated by [[Alternate World Team Rocket]] to make Pokémon easier to steal and train to serve them. Once they had been defeated, Ash, {{an|Dawn}}, [[Goh]], [[Chloe]], and their alternate world counterparts prayed for {{p|Arceus}} to stop the fight, which it did. Afterwards, Dialga and Palkia restored the reverted Pokémon to normal, fulfilling everyone's wish.


==In the manga==
==In the manga==
[[File:Devolution Adventures.png|thumb|220px|Eevee devolving in Pokémon Adventures]]
[[File:Devolution Adventures.png|thumb|220px|Eevee devolving from {{p|Jolteon}} in [[Pokémon Adventures]]]]
===In the Pokémon Adventures manga===
===Pokémon Adventures===
Before [[Vee]], {{adv|Red}}'s {{p|Eevee}}, evolved into {{p|Espeon}}, it had been the subject of an experiment by [[Team Rocket]], which allowed it to evolve into any of its three [[Eeveelution|evolutions]] that were known at the time. It was also able to devolve back into an Eevee and evolve into a different Eeveelution. Although this does mean that devolution is possible in [[Pokémon Adventures]], the artificial means through which this was achieved and the lack of any other instances of devolution suggest that it may not be possible through natural means.
Before [[Vee]], {{adv|Red}}'s {{p|Eevee}}, evolved into {{p|Espeon}}, he had been the subject of an experiment by [[Team Rocket]], which allowed him to evolve into any of his three [[Eeveelution|evolutions]] that were known at the time. He was also able to devolve back into an Eevee and evolve into a different Eeveelution. Although this does mean that devolution is possible in [[Pokémon Adventures]], the artificial means through which this was achieved and the lack of any other instances of devolution suggest that it may not be possible through natural means.
 
===Pokémon Horizon===
{{OBP|Akira|Horizon}}'s {{p|Rockruff}} has the unique ability to evolve into {{p|Lycanroc}} and then devolve into Rockruff again, thanks to the strange red stone on its neck. It also has the ability to change in between its {{DL|List of Pokémon with form differences|Lycanroc|Midday and Midnight Forms}} while being evolved.


===In the Pokémon Pocket Monsters manga===
===Pokémon Pocket Monsters===
Unlike any other media, Pokémon are capable of devolving just as easily as they evolve in [[Pokémon Pocket Monsters]]. This became especially evident when [[Red's Clefairy]] and {{TP|Red|Pikachu|Pikachu (Pocket Monsters)}} evolve into {{p|Clefable}} and {{p|Raichu}} respectively, then revert to their original forms, as well as when {{OBP|Green|Pocket Monsters}}'s {{p|Charmander}} evolved into {{TP|Green|Charizard}} and then turned back into Charmander.
Unlike any other media, Pokémon are capable of devolving just as easily as they evolve in [[Pokémon Pocket Monsters]]. This became especially evident when [[Red's Clefairy]] and {{TP|Red|Pikachu|Pikachu (Pocket Monsters)}} evolve into {{p|Clefable}} and {{p|Raichu}} respectively, then revert to their original forms, as well as when {{PPM|Green}}'s {{p|Charmander}} evolved into {{TP|Green|Charizard}} and then turned back into Charmander.
{{-}}
{{-}}


==In the TCG==
==In the TCG==
In the TCG, devolution is perfectly possible, albeit not at a player's whim. Devolution must be induced by the effects of an attack, a {{TCG|Pokémon Power|Poké-Power}}, or a {{TCG|Trainer card}}. Examples include {{TCG ID|Wizards Promo|Mew|8}}'s Devolution Beam attack, {{TCG ID|Rising Rivals|Flareon|19}}'s Undevelop Poké-Power, and the {{TCG ID|Base Set|Devolution Spray|72}}. Such instances are extremely uncommon. The following is a list of cards that can achieve devolution.
[[File:DevolutionSprayDragonsExalted113.jpg|thumb|200px|{{TCG ID|Base Set|Devolution Spray|72}}, one of the few methods of inducing devolution in the TCG]]
In the TCG, devolution is possible, albeit only through effects rather than as a rule of the game. Examples include {{TCG ID|Wizards Promo|Mew|8}}'s Devolution Beam attack, {{TCG ID|Rising Rivals|Flareon|19}}'s Undevelop {{TCG|Pokémon Power|Poké-Power}}, and the {{TCG ID|Base Set|Devolution Spray|72}} Item.
 
Devolution is performed by removing one or more of the [[Appendix:Glossary (TCG)#Evolution card|Evolution cards]] on top of the {{TCG|Pokémon}} and moving them to another zone. Typically, the cards return to their owner's [[hand]]. This leaves one of the lower stages of that Pokémon visible, and that prior card is now in play. Devolution is only possible for Pokémon that have already [[Evolution#In the TCG|evolved]], meaning they are an ''evolved Pokémon''. This is not to be confused with ''Evolution Pokémon''. For example, if a {{TCG ID|Chilling Reign|Cinderace|28}} is brought into play directly via {{TCG ID|Battle Styles|Single Strike Style Mustard|134}}, it is not able to devolve because it is an unevolved Pokémon and therefore does not have previous Evolutions.
 
A Pokémon that devolved cannot [[Evolution#In the TCG|evolve]] on the same turn, unless some other effect allows it to evolve in spite of this.
 
One of the primary purposes of devolution is reducing the maximum [[HP]] of a Pokémon, as HP usually increases as a Pokémon evolves. If, after devolving, a Pokémon has more [[damage counter]]s on it than its current maximum HP, it is [[Appendix:Glossary (TCG)#Knock Out|Knocked Out]]. Another use case is reusing effects that activate when a Pokémon evolves, although reusing effects in this manner is usually restricted to happening over two turns due to the evolution rules unless there is a second Pokémon in play that can evolve into the Pokémon card that was removed from the first Pokémon.
 
The following is a list of cards that can induce devolution.


{{cardlist/header|Related cards|Psychic|char=yes}}
{{cardlist/header|Related cards|Psychic|char=yes}}
{{cardlist/entry|cardname={{TCG ID|Base Set|Devolution Spray|72}}|type=Item|enset=Base Set|enrarity=Rare|ennum=72/102|enset2=Dragons Exalted|enrarity2=Uncommon|ennum2=113/124|jpsetlink=Base Set|jpset=Expansion Pack|jprarity=Rare|jpset2=Dragon Blast|jprarity2=Uncommon|jpnum2=048/050}}
{{cardlist/entry|cardname={{TCG ID|Base Set|Devolution Spray|72}}|type=Item|expanded=Yes|enset=Base Set|enrarity=Rare|ennum=72/102|jpsetlink=Base Set|jpset=Expansion Pack|jprarity=Rare|enset2=Dragons Exalted|enrarity2=Uncommon|ennum2=113/124|jpset2=Dragon Blast|jprarity2=Uncommon|jpnum2=048/050|jpset3=BW-P Promotional cards|jpnum3=196/BW-P|enset4=Fates Collide|enrarity4=Uncommon|ennum4=95/124|jpset4=Awakening Psychic King|jprarity4=U|jpnum4=067/078|enset5=Evolutions|enrarity5=Uncommon|ennum5=76/108|jpset5=Expansion Pack 20th Anniversary|jprarity5=U|jpnum5=075/087}}
{{cardlist/entry|cardname={{TCG ID|Wizards Promo|Mew|8}}|type=Psychic|enset=Wizards Black Star Promos|ennum=8|enset2=Wizards Black Star Promos|ennum2=9|jpsetlink2=Fossil|jpset2=Mystery of the Fossils|jprarity2=Rare Holo}}
{{cardlist/entry|cardname={{TCG ID|Wizards Promo|Mew|8}}|type=Psychic|enset=Wizards Black Star Promos|ennum=8|enset2=Wizards Black Star Promos|ennum2=9|jpsetlink2=Fossil|jpset2=Mystery of the Fossils|jprarity2=Rare Holo}}
{{cardlist/entry|cardname={{TCG ID|Neo Discovery|Hyper Devolution Spray|73}}|type=Trainer|enset=Neo Discovery|enrarity=Uncommon|ennum=73/75|jpsetlink=Neo Discovery|jpset=Crossing the Ruins...|jprarity=Uncommon|jpset2=Pokémon Web|jprarity2=Uncommon|jpnum2=031/048}}
{{cardlist/entry|cardname={{TCG ID|Neo Discovery|Hyper Devolution Spray|73}}|type=Trainer|enset=Neo Discovery|enrarity=Uncommon|ennum=73/75|jpsetlink=Crossing the Ruins...|jpset=Crossing the Ruins...|jprarity=Uncommon|jpset2=Pokémon Web|jprarity2=Uncommon|jpnum2=031/048}}
{{cardlist/entry|cardname={{TCG ID|Skyridge|Mystery Plate γ|135}}|type=Trainer|enset=Skyridge|enrarity=Uncommon|ennum=135/144|jpsetlink=Split Earth|jpset=Split Earth|jprarity=Uncommon|jpnum=085/088}}
{{cardlist/entry|cardname={{TCG ID|Skyridge|Retro Energy|144}}|type=Energy|energy=Colorless|enset=Skyridge|enrarity=Uncommon|ennum=144/144|jpsetlink=Mysterious Mountains|jpset=Mysterious Mountains|jprarity=Uncommon|jpnum=088/088}}
{{cardlist/entry|cardname={{TCG ID|PLAY Promo|Mew ex|7}}|type=Psychic|jpset=PLAY Promotional cards|jpnum=007/PLAY}}
{{cardlist/entry|cardname={{TCG ID|PLAY Promo|Mew ex|7}}|type=Psychic|jpset=PLAY Promotional cards|jpnum=007/PLAY}}
{{cardlist/entry|cardname={{TCG ID|EX Sandstorm|Omastar|19}}|type=Water|enset=EX Sandstorm|enrarity=Rare|ennum=19/100|enset2=EX Power Keepers|enrarity2=Rare|ennum2=20/108|jpsetlink=EX Team Magma vs Team Aqua|jpset=Magma VS Aqua: Two Ambitions|jprarity=Rare Holo|jpnum=024/080|jpset2=World Champions Pack|jprarity2=Rare|jpnum2=017/108}}
{{cardlist/entry|cardname={{TCG ID|EX Hidden Legends|Ancient Technical Machine Rock|85}}|type=Trainer|enset=EX Hidden Legends|enrarity=Uncommon|ennum=85/101|jpsetlink=EX Hidden Legends|jpset=Undone Seal|jprarity=Uncommon|jpnum=076/083}}
{{cardlist/entry|cardname={{TCG ID|EX Holon Phantoms|Mew ex|100}}|type=Psychic|enset=EX Holon Phantoms|enrarity=Rare Holo ex|ennum=100/110|jpsetlink=Gift Box Mew • Lucario|jpset=Mew Quarter Deck|jpnum=003/015}}
{{cardlist/entry|cardname={{TCG ID|EX Holon Phantoms|Mew ex|100}}|type=Psychic|enset=EX Holon Phantoms|enrarity=Rare Holo ex|ennum=100/110|jpsetlink=Gift Box Mew • Lucario|jpset=Mew Quarter Deck|jpnum=003/015}}
{{cardlist/entry|cardname={{TCG ID|Rising Rivals|Flareon|19}}|type=Fire|enset=Rising Rivals|enrarity=Rare|ennum=19/111|jpsetlink=Rising Rivals|jpset=Bonds to the End of Time|jprarity=Rare|jpnum=011/090}}
{{cardlist/entry|cardname={{TCG ID|Rising Rivals|Flareon|19}}|type=Fire|enset=Rising Rivals|enrarity=Rare|ennum=19/111|jpsetlink=Rising Rivals|jpset=Bonds to the End of Time|jprarity=Rare|jpnum=011/090}}
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{{cardlist/entry|cardname={{TCG ID|Rising Rivals|Vaporeon|34}}|type=Water|enset=Rising Rivals|enrarity=Rare|ennum=34/111|jpsetlink=Rising Rivals|jpset=Bonds to the End of Time|jprarity=Rare|jpnum=014/090}}
{{cardlist/entry|cardname={{TCG ID|Rising Rivals|Vaporeon|34}}|type=Water|enset=Rising Rivals|enrarity=Rare|ennum=34/111|jpsetlink=Rising Rivals|jpset=Bonds to the End of Time|jprarity=Rare|jpnum=014/090}}
{{cardlist/entry|cardname={{TCG ID|Unleashed|Jirachi|1}}|type=Psychic|enset=Unleashed|enrarity=Rare Holo|ennum=1/95|jpsetlink=Leafeon vs Metagross Expert Deck|jpset=Metagross Deck|jpnum=006/014|enset2=Call of Legends|enrarity2=Rare Holo|ennum2=11/95}}
{{cardlist/entry|cardname={{TCG ID|Unleashed|Jirachi|1}}|type=Psychic|enset=Unleashed|enrarity=Rare Holo|ennum=1/95|jpsetlink=Leafeon vs Metagross Expert Deck|jpset=Metagross Deck|jpnum=006/014|enset2=Call of Legends|enrarity2=Rare Holo|ennum2=11/95}}
{{cardlist/entry|cardname={{TCG ID|Dragons Exalted|Golurk|59}}|type=Psychic|enset=Dragons Exalted|enrarity=Rare Holo|ennum=58/124|jpset=Dragon Blade|jprarity=R|jpnum=023/050|enset2=Boundaries Crossed|enrarity2=Rare Secret|ennum2=150/149|jpset2=Freeze Bolt|jprarity2=UR|jpnum2=064/059}}
{{cardlist/entry|cardname={{TCG ID|Dragons Exalted|Golurk|59}}|type=Psychic|expanded=Yes|enset=Dragons Exalted|enrarity=Rare Holo|ennum=59/124|jpset=Dragon Blade|jprarity=R|jpnum=023/050|enset2=Boundaries Crossed|enrarity2=Rare Secret|ennum2=150/149|jpset2=Freeze Bolt|jprarity2=UR|jpnum2=064/059}}
{{cardlist/entry|cardname={{TCG ID|Ancient Origins|Claydol|33}}|type=Psychic|expanded=Yes|enset=Ancient Origins|enrarity=Rare|ennum=33/98|jpset=Bandit Ring|jprarity=U|jpnum=033/081}}
{{cardlist/entry|cardname={{TCG ID|Ancient Origins|Porygon-Z|67}}|type=Colorless|expanded=Yes|enset=Ancient Origins|enrarity=Rare Holo|ennum=67/98|jpset=Bandit Ring|jprarity=R|jpnum=067/081}}
{{cardlist/entry|cardname=[[Espeon-EX (BREAKpoint 52)|Espeon]]{{EX}}|type=Psychic|expanded=Yes|enset=BREAKpoint|enrarity=Rare Holo ex|ennum=52/122|jpset=Rage of the Broken Heavens|jprarity=RR|jpnum=035/080|enset2=BREAKpoint|enrarity2=Rare Ultra|ennum2=117/122|jpset2=Rage of the Broken Heavens|jprarity2=SR|jpnum2=084/080|jpset3=The Best of XY|jpnum3=045/171}}
{{cardlist/entry|cardname={{TCG ID|Burning Shadows|Porygon-Z|105}}|type=Colorless|expanded=Yes|enset=Burning Shadows|enrarity=Rare Holo|ennum=105/147|jpset=Darkness that Consumes Light|jprarity=R|jpnum=044/051|enset2=Miscellaneous Promotional cards|ennum2=105a/147|jpset2=SM-P Promotional cards|jpnum2=070/SM-P}}
{{cardlist/entry|cardname={{TCG ID|Shining Legends|Shining Jirachi|42}}|type=Psychic|expanded=Yes|enset=Shining Legends|enrarity=Shining Holo|ennum=42/73|jpset=Shining Legends|jprarity=Shining Holo|jpnum=043/072}}
{{cardlist/entry|cardname=[[Celebi ♢ (Lost Thunder 19)|Celebi]] {{Prism Star}}|type=Grass|expanded=Yes|enset=Lost Thunder|enrarity=Rare Holo|ennum=19/214|jpset=Super-Burst Impact|jprarity=PR|jpnum=015/095}}
{{cardlist/entry|cardname={{TCG ID|Lost Thunder|Dialga|127}}|type=Metal|expanded=Yes|enset=Lost Thunder|enrarity=Rare Holo|ennum=127/214|jpset=Thunderclap Spark|jprarity=R|jpnum=038/060}}
{{cardlist/entry|cardname={{TCG ID|Unbroken Bonds|Devolution Spray Z|166}}|type=Item|expanded=Yes|enset=Unbroken Bonds|enrarity=Uncommon|ennum=166/214|jpset=Full Metal Wall|jprarity=U|jpnum=044/054}}
{{cardlist/entry|cardname={{TCG ID|Unified Minds|Celebi|4}}|type=Grass|expanded=Yes|enset=Unified Minds|enrarity=Rare Holo|ennum=4/236|jpset=Miracle Twin|jprarity=R|jpnum=003/094}}
{{cardlist/entry|cardname={{TCG ID|Pokémon Card 151|Aerodactyl|142}}|type=Colorless|standard=Yes|enset=151|enrarity=Rare|ennum=142/165|jpset=Pokémon Card 151|jprarity=R|jpnum=142/165}}
{{cardlist/entry|cardname={{TCG ID|Paradox Rift|Technical Machine: Devolution|177}}|type=Pokémon Tool|standard=Yes|enset=Paradox Rift|enrarity=Uncommon|ennum=177/182|jpset=Ancient Roar|jprarity=U|jpnum=63/66}}
{{cardlist/footer|Psychic}}
{{cardlist/footer|Psychic}}


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<references/>
<references/>


==Related Articles==
* [[Evolution]]
* [[Beast killer project]]
[[Category:Pokémon world]]
[[Category:Pokémon world]]
[[Category:Terminology]]
[[Category:Terminology]]


[[de:Rückentwicklung]]
[[it:Devoluzione]]
[[it:Devoluzione]]
[[zh:退化]]

Latest revision as of 01:16, 25 February 2024

Slowbro losing Shellder

Devolution (Japanese: 退化 degeneration) is the process by which an evolved Pokémon reverts to its previous form. This process is much less common than evolution due to being impossible within the core series games. In most media in which it exists, devolution is often instigated through artificial means, such as sprays or genetic engineering.

In the core series games

Slowking losing Shellder

While devolution is not possible within the core series games as a mechanic, the notion is referred to by Slowbro's numerous Pokédex entries. Said entries claim that if the Shellder falls off, the Slowbro turns back into a Slowpoke. It is said that if Slowking loses its Shellder, it forgets everything it has learned.[1]

A similar situation applies to Exeggutor, as it is stated in its Pokédex entries that if one of its heads were to fall off, that head would become an Exeggcute.

Silvally, a Pokémon who had previously gone by the name Type: Full were given control helmets to prevent its RKS System from functioning. This had caused the Pokémon to be renamed to Type: Null, essentially devolving it into an inferior species. Type: Null, both in lore and gameplay, can evolve back into Silvally.

In Melmetal's Pokédex entry for Pokémon Sword, it is stated that, at the end of a Melmetal's lifespan, its leftover shards will return to being Meltan.

In the spin-off games

Pokémon Mystery Dungeon

The only Pokémon games in which devolution is possible are games from the Pokémon Mystery Dungeon series games of the Nintendo 3DS.

In Pokémon Mystery Dungeon: Gates to Infinity, the Devolve Orb is a Wonder Orb that devolves all enemies in the room.

201
Spoiler warning: this article may contain major plot or ending details.
201

In Pokémon Super Mystery Dungeon, the player and their partner evolve and later devolve three times during the game's main story, thanks to the Harmony Scarves they wear.

201 Spoilers end here. 201

Pokémon Trading Card Game

Pokémon cards can devolve in Pokémon Trading Card Game video games, which contain cards that can cause devolution.

Pokémon UNITE

The opening cutscene for Pokémon UNITE shows Talonflame, Slowbro, Greninja, Cinderace, and Garchomp devolving into their base forms of Fletchling, Slowpoke, Froakie, Scorbunny, and Gible, respectively. This suggests that experienced Pokémon that participate in Unite Battles are devolved to their base forms inside the stadium in order to evolve again during the game. However, Pokémon with baby forms, such as Pikachu and Mr. Mime, do not devolve to their baby stages.

In the Practice Area mode, if the player uses the Reset Level function in the Practice Options menu to return a Pokémon to Level 1, that Pokémon will devolve back into their base form. Just like evolution, Pokémon are invincible while devolving.

In the anime

Wobbuffet devolving in the anime

In the Pokémon anime, the subject of devolution has rarely been brought up. Misty explicitly states in Electric Shock Showdown that evolution cannot be reversed, effectively confirming the nonexistence of devolution within the anime. This was reconfirmed in A Stealthy Challenge!, where Bonnie asked Frogadier to devolve into Froakie so she could see it evolve again, but Clemont explained that it doesn't work that way.

In Dream a Little Dream from Me!, Ash's Pikachu had a nightmare featuring Frogadier having devolved into Froakie. Clemont's Bunnelby, which appeared as a Diggersby in the same nightmare, also devolved back into its first stage later in the dream.

The first known instance of a real devolution in the anime occurred when Faba fitted Silvally with a restraining mask, thereby turning it into a Type: Null.

In The Gates of Warp!, Pokémon in an alternate world version of Sinnoh devolved due to Dialga and Palkia's battle, with most of them eventually reverting all the way into Eggs. In Showdown at the Gates of Warp!, this battle was revealed to have been orchestrated by Alternate World Team Rocket to make Pokémon easier to steal and train to serve them. Once they had been defeated, Ash, Dawn, Goh, Chloe, and their alternate world counterparts prayed for Arceus to stop the fight, which it did. Afterwards, Dialga and Palkia restored the reverted Pokémon to normal, fulfilling everyone's wish.

In the manga

Eevee devolving from Jolteon in Pokémon Adventures

Pokémon Adventures

Before Vee, Red's Eevee, evolved into Espeon, he had been the subject of an experiment by Team Rocket, which allowed him to evolve into any of his three evolutions that were known at the time. He was also able to devolve back into an Eevee and evolve into a different Eeveelution. Although this does mean that devolution is possible in Pokémon Adventures, the artificial means through which this was achieved and the lack of any other instances of devolution suggest that it may not be possible through natural means.

Pokémon Horizon

Akira's Rockruff has the unique ability to evolve into Lycanroc and then devolve into Rockruff again, thanks to the strange red stone on its neck. It also has the ability to change in between its Midday and Midnight Forms while being evolved.

Pokémon Pocket Monsters

Unlike any other media, Pokémon are capable of devolving just as easily as they evolve in Pokémon Pocket Monsters. This became especially evident when Red's Clefairy and Pikachu evolve into Clefable and Raichu respectively, then revert to their original forms, as well as when Green's Charmander evolved into Charizard and then turned back into Charmander.

In the TCG

Devolution Spray, one of the few methods of inducing devolution in the TCG

In the TCG, devolution is possible, albeit only through effects rather than as a rule of the game. Examples include Mew's Devolution Beam attack, Flareon's Undevelop Poké-Power, and the Devolution Spray Item.

Devolution is performed by removing one or more of the Evolution cards on top of the Pokémon and moving them to another zone. Typically, the cards return to their owner's hand. This leaves one of the lower stages of that Pokémon visible, and that prior card is now in play. Devolution is only possible for Pokémon that have already evolved, meaning they are an evolved Pokémon. This is not to be confused with Evolution Pokémon. For example, if a Cinderace is brought into play directly via Single Strike Style Mustard, it is not able to devolve because it is an unevolved Pokémon and therefore does not have previous Evolutions.

A Pokémon that devolved cannot evolve on the same turn, unless some other effect allows it to evolve in spite of this.

One of the primary purposes of devolution is reducing the maximum HP of a Pokémon, as HP usually increases as a Pokémon evolves. If, after devolving, a Pokémon has more damage counters on it than its current maximum HP, it is Knocked Out. Another use case is reusing effects that activate when a Pokémon evolves, although reusing effects in this manner is usually restricted to happening over two turns due to the evolution rules unless there is a second Pokémon in play that can evolve into the Pokémon card that was removed from the first Pokémon.

The following is a list of cards that can induce devolution.

Related cards
Cards listed with a blue background are only legal to use in the current Expanded format.
Cards listed with a green background are legal to use in both the current Standard and Expanded formats.
Card Type English
Expansion
Rarity # Japanese
Expansion
Rarity #
Devolution Spray I Base Set Rare 72/102 Expansion Pack Rare  
Dragons Exalted Uncommon 113/124 Dragon Blast Uncommon 048/050
      BW-P Promotional cards   196/BW-P
Fates Collide Uncommon 95/124 Awakening Psychic King U 067/078
Evolutions Uncommon 76/108 Expansion Pack 20th Anniversary U 075/087
Mew Psychic Wizards Black Star Promos   8      
Wizards Black Star Promos   9 Mystery of the Fossils Rare Holo  
Hyper Devolution Spray T Neo Discovery Uncommon 73/75 Crossing the Ruins... Uncommon  
      Pokémon Web Uncommon 031/048
Mystery Plate γ T Skyridge Uncommon 135/144 Split Earth Uncommon 085/088
Retro Energy Colorless E Skyridge Uncommon 144/144 Mysterious Mountains Uncommon 088/088
Mew ex Psychic       PLAY Promotional cards   007/PLAY
Omastar Water EX Sandstorm Rare 19/100 Magma VS Aqua: Two Ambitions Rare Holo 024/080
EX Power Keepers Rare 20/108 World Champions Pack Rare 017/108
Ancient Technical Machine Rock T EX Hidden Legends Uncommon 85/101 Undone Seal Uncommon 076/083
Mew ex Psychic EX Holon Phantoms Rare Holo ex 100/110 Mew Quarter Deck   003/015
Flareon Fire Rising Rivals Rare 19/111 Bonds to the End of Time Rare 011/090
Jolteon Lightning Rising Rivals Rare 26/111 Bonds to the End of Time Rare 028/090
Vaporeon Water Rising Rivals Rare 34/111 Bonds to the End of Time Rare 014/090
Jirachi Psychic Unleashed Rare Holo 1/95 Metagross Deck   006/014
Call of Legends Rare Holo 11/95      
Golurk Psychic Dragons Exalted Rare Holo 59/124 Dragon Blade R 023/050
Boundaries Crossed Rare Secret 150/149 Freeze Bolt UR 064/059
Claydol Psychic Ancient Origins Rare 33/98 Bandit Ring U 033/081
Porygon-Z Colorless Ancient Origins Rare Holo 67/98 Bandit Ring R 067/081
EspeonEX Psychic BREAKpoint Rare Holo ex 52/122 Rage of the Broken Heavens RR 035/080
BREAKpoint Rare Ultra 117/122 Rage of the Broken Heavens SR 084/080
      The Best of XY   045/171
Porygon-Z Colorless Burning Shadows Rare Holo 105/147 Darkness that Consumes Light R 044/051
Miscellaneous Promotional cards   105a/147 SM-P Promotional cards   070/SM-P
Shining Jirachi Psychic Shining Legends Shining Holo 42/73 Shining Legends Shining Holo 043/072
Celebi Prism Star Grass Lost Thunder Rare Holo 19/214 Super-Burst Impact PR 015/095
Dialga Metal Lost Thunder Rare Holo 127/214 Thunderclap Spark R 038/060
Devolution Spray Z I Unbroken Bonds Uncommon 166/214 Full Metal Wall U 044/054
Celebi Grass Unified Minds Rare Holo 4/236 Miracle Twin R 003/094
Aerodactyl Colorless 151 Rare 142/165 Pokémon Card 151 R 142/165
Technical Machine: Devolution PT Paradox Rift Uncommon 177/182 Ancient Roar U 63/66
 


References

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