Disputed Pokémon

Main article: Shellder (Pokémon)

Main article: Slowbro (Pokémon)

Main article: Slowking (Pokémon)

According to the Pokédex and in the anime, Slowpoke evolves into Slowbro or Slowking via Shellder. Shellder clamps onto a Slowpoke's tail to evolve into Slowbro, or onto its head while wearing the King's Rock to evolve into a Slowking. In Galar, it clamps onto the regional Slowpoke's arm and causes a poisonous reaction. Even though Shellder changes form drastically when it bonds with Slowpoke to evolve, it is not considered an evolution in and of itself. Mega Slowbro has the Shellder engulf most of Slowbro's body, essentially making it a shell for Mega Slowbro.

Main article: Kangaskhan (Pokémon)

Kangaskhan carries around a little blue baby Kangaskhan in their pouch. The baby Kangaskhan lacks the ridges and patches on its mother's body, and its small fangs are not visible outside of its mouth. Even with the advent of breeding and baby Pokémon, the baby Kangaskhan has yet to be made into a separate Pokémon, and as a result, all Kangaskhan are born with a baby already in its pouch. As part of Kangaskhan's Mega Evolution, however, the baby leaves its pouch and is capable of fighting alongside its mother, thanks to Mega Kangaskhan's Parental Bond Ability.

Main article: Raikou (Pokémon)

Main article: Entei (Pokémon)

Main article: Suicune (Pokémon)

Main article: Legendary beasts

It is said that the Legendary beasts Raikou, Entei, and Suicune were reincarnated after they died in the fire that burned down the Brass Tower by Ho-Oh. They were said to represent the lightning that struck the tower, the fire that burned the tower down, and the rain that put it out. While it is unknown in the games if these three were already a Raikou, Entei, and Suicune before they were revived, the Pokémon Generations short The Reawakening showed that they were three, nameless Pokémon.

Main article: Vullaby (Pokémon)

Main article: Mandibuzz (Pokémon)

According to interviews with Ken Sugimori in Nintendo Dream, the bones that Vullaby and Mandibuzz wear are those of other Pokémon. However, it is not stated which Pokémon they are from, and as the skeletal systems for the majority of Pokémon have yet to be revealed, it is unknown if they are meant to be the bones of a specific Pokémon. However, the skull that Vullaby wears as a diaper is similar to a human skull, which may indicate that the bones are from a Pokémon in the Human-Like Egg Group.

Main article: Reshiram (Pokémon)

Main article: Zekrom (Pokémon)

Main article: Kyurem (Pokémon)

Main article: Tao trio

According to one legend, Reshiram and Zekrom were once a single powerful Dragon Pokémon used by twin heroes in order to create the Unova region. But the brothers each sought something different in life—truth for the older brother and ideals for the younger—and they began to argue, then fight, over whose side was right. The single dragon, in response, split into two Pokémon: Reshiram, who sided with the older twin, and Zekrom, who sided with the younger twin. A different narrative is told by Ghetsis and Drayden in Black 2 and White 2: when the original dragon split into Reshiram and Zekrom, a third dragon, Kyurem, was "created" from the leftovers. The Pokédex entry for Kyurem also states that it is waiting for a hero to fill in the missing parts of its body with "truth or ideals". Kyurem can be with Reshiram or Zekrom to form White Kyurem and Black Kyurem, respectively, using DNA Splicers.

Main article: Genesect (Pokémon)

While Genesect is a cyborg Pokémon, it did not previously take this form. The modern Genesect was revived by Team Plasma from a fossil of this Pokémon, and modified into its present appearance. According to Genesect's Pokédex entries, it existed over 300 million years ago, and was feared as a powerful hunter. Due to its lack of Team Plasma alterations, it is unlikely that it would have been part Steel-type, nor would it have access to Techno Blast or similar moves.

In Genesect and the Legend Awakened and its manga adaptation, fossilized parts of the original Genesect's body are seen. These fossils bear a great similarity to the bodily structure of the modern Genesect. However, these fossils have not yet been seen anywhere outside of the anime.

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Main article: Dracozolt (Pokémon)

Main article: Arctozolt (Pokémon)

Main article: Dracovish (Pokémon)

Main article: Arctovish (Pokémon)

There are four types of Fossils in Gen VIII games, but none of them is complete. Machine made by Dr. Cara Liss can combine two of them into one hybrid creature, but only halves of their true forms are known: heavy spiked Dragon-type dinosaur «Draco…», Ice-type marine creature «Arcto…», Electric-type bird-like dinosaur «…zolt» and Water-type placoderm «…vish».

Main article: Dreepy (Pokémon)
Dreepy lived in the prehistoric seas, and now it's just a ghost. It is unknown if either its modern shape, behavior or evolution is similar to the ancient form.

Main article: Dark Rust

Dark Rust is a living Wonder Key and the commander of the Rust Army in Pokémon Rumble Blast. It can be fought in the fifth and final chamber of the Team Battle in World Axle - Deepest Level. Although Dark Rust is not considered to be a real Pokémon, it actually has its own cry.

Main article: Bittercold

Bittercold is a living lifeform that is trying to destroy Mist Continent. It can be fought in Glacier Palace's Great Spire. Although Bittercold is not considered to be a real Pokémon, it used unnamed moves to hinder Pokémon.

Main article: Void Shadows

Void Shadows inhabit the Voidlands and will consume any Pokémon they encounter and are capable of shapeshifting into any Pokémon. Being minions of Dark Matter, the Void Shadows do not seem to have an individual personality. However, they seem to be akin to Ditto in that they can act as if they were another Pokémon; for example, one of them disguises itself as Bunnelby. While they do not seem to be much in the way of speech, they are very aggressive to the player and their partner; going as far as to take on the form of a Mega Tyranitar and a pair of Mega Gengar as a means to stop them from returning to their world—they are even willing to kill them to stop them. Unlike other Pokémon, their character portrait is obscured by static, much like that of Dark Matter.

Main article: Dark Matter

Dark Matter is a living lifeform that is trying to send all Pokémon to the Voidlands and to return the Pokémon world to the void. It can be fought after clearing Tree of Life: Trunk. Although Dark Matter is not considered to be a real Pokémon, it can use moves against Pokémon and can give itself a random type.

Kabutops and the fish first appeared in concept art from Pokémon Red and Green and bears some similarities to the silhouette on the Neo Genesis card Super Rod.

It is similar to the Clay Doll Pokémon Baltoy and Claydol and thus may have been based on shakōki-dogū, clay figurines from the Jōmon period of Japanese history.

Main article: Unown (Pokémon)

Unreleased Unown seen on Professor Oak's computer. Due to the introduction of two additional Unown forms in Generation III, some fans have speculated that these may have been very early prototypes for new forms of Unown. Some of the Unown resemble various Greek and Cyrillic letters, namely Я, Ω, Σ, б, Д, ω, Π, and σ.

Main article: Thu-Fi-Zer

Thu-Fi-Zer (サ・ファイ・ザー Thu-Fi-Zer) was the result of a Team Rocket experiment created by fusing the three legendary birds—Articuno, Zapdos, and Moltres—in the Pokémon Adventures manga.

This article is incomplete. Please feel free to edit this article to add missing information and complete it. Reason: Overworld sprite of Eterna City statue

Main article: Dialga (Pokémon)

Main article: Palkia (Pokémon)

In the Pokémon Adventures manga the statue in Eterna City is neither Dialga or Palkia but a combination of the two statues. This is a reflection of the statue's appearance in Pokémon Diamond and Pearl and Pokémon Platinum being ambiguously shaped in order to represent a different member of the duo in each game.

After seeing the two Pokémon for the first time in Spear Pillar, Pearl theorized that the statue could represent how ancient people saw the two Pokémon fighting inside a distortion of space and time which led them to believe it was one Pokémon.

Main article: Vivillon (Pokémon)
On the cover of this chapter Red is shown surrounded by three stylized and mostly identical butterfly-like creatures with different patterns on their wings. Their overall shape and coloration gimmick quite noticeable resemble Vivillons.

Main article: Persian (Pokémon)

A Persian with a third eye in the place where its gem would normally be appeared in The Big Battle In The Viridian Forest!!.

Main article: MechaMew2

MechaMew2 is a Robotic Pokémon seen only in Pokémon Live!. It is considered by its creator Giovanni to be the most powerful Pokémon in existence. Giovanni promised Trainers the very rare Diamond Badge to anyone who could defeat it. MechaMew2 is based on Mewtwo, another Pokémon whose creation was ordered by Giovanni. It destroys itself at the end of the show after learning an attack of love, caring, and friendship.