Pokémon fusion

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Under rare circumstances, some Pokémon have been known to combine with other Pokémon or even people. This phenomenon, sometimes called fusion, has appeared across various Pokémon media, including the games, anime, and manga. Some Pokémon Evolutions are said to result from the merging of two or more Pokémon, with separation resulting in devolution in certain cases.

Additionally, Pokémon fusion has been a popular subject in the Pokémon fandom and is the focus of some notable fan projects and websites.

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

List of Pokémon fusions

Shellder and Slowpoke

If a Shellder bites on to a particular part of Slowpoke's body, Slowpoke may evolve, causing Slowpoke and Shellder to combine and change in appearance. If the two are separated, they will devolve back into their components.

If Shellder bites on to Slowpoke's tail, Slowpoke will evolve into Slowbro.
If Shellder bites on to Galarian Slowpoke's arm while Slowpoke wears a Galarica Cuff, Slowpoke will evolve into Galarian Slowbro.
If Slowbro Mega Evolves, the Shellder will take over most of Slowbro's body.
If Shellder bites on to Slowpoke's head while Slowpoke wears a King's Rock, Slowpoke will evolve into Slowking.
If Shellder bites on to Galarian Slowpoke's head while Slowpoke wears a Galarica Wreath, Slowpoke will evolve into Galarian Slowking.

This method of Evolution has only been shown outside of the core series games, though it is mentioned in the Pokédex.

Slowpoke
Shellder
Shellder attached to Slowbro
Shellder attached to Galarian Slowbro
Shellder attached to Mega Slowbro
Shellder attached to Slowking
Shelder attached to Galarian Slowking

Magnemite and Magneton

Three Magnemite link together to evolve into Magneton, and stay merged as Magnezone. The Paradox Pokémon Sandy Shocks appears to be an ancestor of Magneton composed of three units that resemble ancient versions of Magnemite.

This method of Evolution is only shown in Pokémon Snap. In the core series games, it is only mentioned in the Pokédex. Additionally, Pokémon Snap is one of the few times that two Magnemite have been shown bonding, similar to a Magneton. However, when a picture is taken, they are still called Magnemite. Two Magnemite are also seen linked together in Pokémon Mystery Dungeon: Red Rescue Team and Blue Rescue Team and Pokémon Mystery Dungeon: Rescue Team DX, but it was stated to be a failed Evolution, due to the lack of a third Magnemite.

Beldum, Metang, and Metagross

Two Beldum fuse together to evolve into Metang, and two Metang fuse to evolve into Metagross. When Metagross Mega Evolves, it temporarily links up with two more Beldum and a Metang.

This method of Evolution has never been shown in any Pokémon media, though it is mentioned in the Pokédex. In Saved by the Beldum, the only anime episode to date to show a Beldum Evolution, when Morrison's Beldum evolves into Metang, it "creates" another Beldum and newly developed main body to evolve, instead of fusing with another Beldum. Despite this, in The Synchronicity Test!, the Pokédex claims that "Metang is created from the union of two Beldum."

Reshiram, Zekrom, and Kyurem

When using the DNA Splicers, Kyurem can do the Absofusion (Japanese: 吸収合体 Absorb Union) process to absorb Reshiram or Zekrom into itself, fusing into either White Kyurem or Black Kyurem. The same fusion can be undone either if Kyurem is defeated or DNA Splicers are used again.

Solgaleo, Lunala, and Necrozma

Necrozma can forcibly fuse itself Solgaleo or Lunala as body armor, taking complete control of both body and mind of the hoist. The fusion can also be achieved by using N-Solarizer for Solgaleo or N-Lunarizer for Lunala. Necrozma uses this fusion to help maintain and store the necessary light to become Ultra Necrozma. The fusion can be undone if Necrozma is defeated or using respective items.

Glastrier, Spectrier, and Calyrex

Calyrex can use the Reins of Unity to unite with either Glastrier or Spectrier to form Ice Rider Calyrex or Shadow Rider Calyrex. Unlike the fusions of Kyurem and Necrozma, this fusion is simply Calyrex riding the Legendary Pokémon instead of fusing physically. Calyrex gains a cape and crown-like bud glows with power constantly. The fusion can be undone if Calyrex loses power or uses the Rein of Unity again.

In the core series games

Various Pokémon and Bill

Bill fused with a Clefairy in Pokémon FireRed and LeafGreen

In the Kanto-based games, Bill is seen in his Sea Cottage fused with a Pokémon, temporarily taking on its appearance while retaining the ability to talk. He asks the player to help him use the Cell Separation System to turn back to normal.

The specific Pokémon that Bill fuses with differs across media. In Generation I, he is fused with an unknown Pokémon. In Pokémon FireRed and LeafGreen, he is fused with a Clefairy. In Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!, he is fused with a Nidorino. In the Pokémon Adventures manga, he is fused with a Rattata. In the Pokémon Zensho manga, he is mixed with a Nidoran♂. In the anime, he is simply trapped in a Kabuto costume.

Nihilego and Lusamine

Nihilego fused with Lusamine in Pokémon Sun and Moon

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In the spin-off games

Detective Pikachu Returns

Deoxys and Charles Merloch

In the anime

Venustoise

In The Ghost of Maiden's Peak, a Gastly, who had the ability to create illusions that were tangible enough to attack people, created a fusion of Venusaur and Blastoise to scare Bulbasaur and Squirtle, calling it a "Venustoise" (Japanese: フシギックス Fushigix).

Gastly's illusory Venusaur
Gastly's illusory Blastoise
Venustoise

Mismagius and Rayquaza

In Malice in Wonderland!, a real Mismagius merged with a Rayquaza illusion it created, giving Rayquaza the color palette and some features of Mismagius. It then attacked Ash and his friends.

Mismagius
Rayquaza
Mismagius and Rayquaza fusion

In the manga

Pokémon Adventures

Thu-Fi-Zer

Main article: Thu-Fi-Zer

A combination of Articuno, Zapdos, and Moltres made by Team Rocket in the Pokémon Adventures manga. The Legendary birds were later freed.

Articuno
Zapdos
Moltres
Thu-Fi-Zer

Pokémon Pocket Monsters

Red's Clefairy and Blue's Mewtwo

Pokémon RéBURST

Main article: Burst

Ryouga after combining with Zekrom

Burst is a special technique in the Pokémon RéBURST manga that allows a human to combine with a Pokémon, gaining its powers and immunities while increasing the user's physical and defensive strengths.

In order for one to perform Burst, they will need a special item known as a Burst Heart, a small, pocket sized jewel that actually holds a Pokémon inside of it, sealed so that its power can be used by anyone wishing to fuse with it. Once Burst is activated, the user will have their physical traits increased greatly. Whatever abilities the user will get depends on the type of Pokémon used to combine. Additionally, a person can be sent inside of their Burst Heart in order to better connect with the Pokémon inside.

For a list of known Burst Warriors, see here.

In POKÉMON Detective Pikachu

In the fandom

Splicing

Splicing is the process of taking existing Pokémon sprites and combining them to create new and unique sprites. These sprites may represent literal fusions of the component Pokémon or other ideas such as entirely original Pokémon or altered versions of existing Pokémon. These sprites may be created as fan art or to be added to fan games, as well as to be shared in online communities and forums.

Fan sites

https://pokemon.alexonsager.net/ - Pokémon Fusion
https://japeal.com/pkm/ - Pokémon Fusion Generator

Fan games

Pokémon Infinite Fusion - forum thread

Trivia

Iron Valiant resembles a fusion of Gardevoir and Gallade with traits of their Mega Evolutions.