Human–Pokémon transformation

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The subject of this article has no official name.
The name currently in use is a fan designator; see below for more information.

Under various unusual circumstances, there have been humans who have temporarily transformed into Pokémon.

Bill transformed into Clefairy

In the core series games

In the Kanto-based games, Bill accidentally combines himself with a Pokémon and transforms into either Nidorino, Clefairy, or an indistinct Pokémon ( ) while performing a teleportation experiment.
In the Sinnoh-based games, a book in Canalave Library contains a folk story about a Pokémon living in a forest that sheds its hide to sleep as a human, and when awoken the human dons the Pokémon hide to roam villages.

Pokédex entries

A few Pokédex entries refer to Pokémon that were once human. In addition to these entries, several Pokémon, particularly Ghost types, are stated in the Pokédex to be formed from the souls or grudges of deceased humans.

Pokémon	Description
Kadabra	A Pokédex entry states that one morning a boy with extrasensory powers awoke in bed transformed into Kadabra. Pocket Monsters Encyclopedia expands on the topic in a short story titled "The Transformation".
Gengar	Gengar was once a human itself. It tries to create another one by taking the lives of other humans.
Cofagrigus	People say that Cofagrigus was once human but it no longer remembers it.

In spin-off games

Pokémon Mystery Dungeon series

Pokémon Mystery Dungeon: Red Rescue Team and Blue Rescue Team and Pokémon Mystery Dungeon: Rescue Team DX: The hero was asked to save the world by Gardevoir. They volunteered to transform into a Pokémon, and voluntarily chose to erase their memories as a human.
Pokémon Mystery Dungeon: Explorers of Sky: The hero, along with their partner Grovyle, was traveling to the past on a mission to collect the Time Gears and prevent the planet's paralysis. However, while traveling through time, they were attacked by Darkrai, who sought to stop them from changing the dark future. As a result of this incident, the hero was transformed into a Pokémon.
Pokémon Mystery Dungeon: Gates to Infinity: The hero was asked to save the Pokémon world in a dream by Hydreigon, the Voice of Life. They transform into a Pokémon and fall from the sky into the Pokémon world.
Pokémon Super Mystery Dungeon: The hero was summoned to the Pokémon world by the spirit of Mew, who they defeated Dark Matter together with in the ancient past. However, after arriving in the Pokémon world, they were attacked by Nuzleaf and Beheeyem, who knocked them out. After waking up, they had lost all their memories, to which Nuzleaf took advantage of to deceive them.

In animation

In the episode Hocus Pokémon, Ash was transformed into a Pikachu by a magic spell.
In the movie The Rise of Darkrai, Baron Alberto was transformed into a Lickilicky.
In the Pokétoon video Help! I've Turned into a Gengar, Hilary somehow temporarily transforms into a Gengar.

Trivia

In Pokémon X and Y, Valerie expresses her desire to become a Pokémon and creates clothing to imitate one.