The Pokemon Evolution Theories is a page dedicated to minor theories about the origin of certain Pokemon, the evolutionary chains of certain Pokemon, and miscellaneous guesses on connections between two Pokemon species. None of these theories should really be big enough to warrant a whole page. If a theory gets too big, it should be put into a new page and the link to it should be place in this section, underneath its own title.
Aerodactyl Evolved into Zubats
Aerodactyl have gone extinct in the Pokemon world. This theory states that they evolved in the Bat Pokemon, Zubat. Upon initial inspection, their body, wingspan, and the style of the wings are very similar. Aerodactyl's shiny version has a closer color scheme to Crobat, Zubat's next evolutionary stage, as well. Crobat only possesses teeth on its lower jaw and Aerodactyl's lower jaw is built heavily, with only a break and no teeth visible for the upper jaw. Aerodactyl knows Supersonic, Bite and Wing attacks for its starting moves, and Zubat quickly learns these as its initial level-up moves.
Bulbasaur/Oddish Symbiosis
The "plant" on Bulbasaur's back is really an Oddish growing symbiotically with what would otherwise be a fleshy, defenseless baby frog. The Oddish gets more nutrients than it would get sulking around at night. Oddish feet are supposedly its roots, and it can learn ingrain, and then do so into the skeleton and nervous system of the Bulbasaur. Female Venusaur's are pictured to have a seedling in them, possibly suggesting they are always "fertile" and producing seeds. If a male Venusaur is around, a Bulbasaur will be born! If not, the seed will germinate into an Oddish.
Butterfree and Venomoth's Sprites Were Switched
When Butterfree and Venomoth's evolutionary chains are put next to each other, some people may say that Butterfree and Venomoth look like they should switch places. Both of these Pokemon's sprites are much better suited for the other one's chain.
Cubones Wear the Remains of Their Mother
When a mother Kangaskhan dies, it leaves its Kangaskhan cub on its own. The Kangaskhan cub uses the skull and a bone from its mother to use as protection and becomes a Cubone. Then through malnutrition or adapting to a different lifestyle, the Cubone evolves into a Marowak. Female Marowak's later evolve into Kangaskhans, and the cycle starts all over. This is self evident, as Cubone appears rather similar to the baby Kangaskhan that rides around in its mother's pouch. Also, 'Bonemerang' (Cubone's signature move) refers to boomerang just as 'Kangaskhan' refers to Kangaroo. Kangaroo and boomerangs are both natively Australian themes. Before Pokemon Red/Blue released, the developers decided that Kangaskhan needed to be separated from the previous two stages to become its own standalone Pokemon. The reason for this is that, being a kids game, it wouldn't do to allow small children to learn that a Cubone is actually an orphaned baby Kangaskhan wearing its dead mother's skull on its head and slinging its bones around like clubs and boomerangs. However, the team didn't have time to delete the code at the last minute. Instead of deleting the code, they simply wrote a new non-evolving Marowak and moved the old one to an empty slot... with no number. This catchable Pokemon is M', Missingno's sister. M' is actually a scrapped prototype of Marowak. This theory can be confirmed if you catch a M' and level it up, it evolves into a Kangaskhan.
Gengar is Clefable's Shadow
Through beta artwork, Clefable and Gengar have been confirmed to one of the earliest designed Pokemon. Clefairy, Clefable's preceding evolutionary stage, was originally going to be the mascot of the series, instead of Pikachu. It was going to be a pretty important Pokemon to say the least. Gengar is known as the "Shadow Pokemon", but the shadow of what?
Well, take a look at a picture of Clefable, then of Gengar. Their body shapes are almost exactly alike, with the only real difference being that Clefable has a swirly hair, while Gengar has spikey hair. Now, look at their typings -- Clefable is a "normal" type while Gengar is a "ghost" type. Due to both of their immunities, neither of them can hit each other with STAB attacks, since they'd be immune to each other. You ever tried to hit your shadow? Additionally, Gengar is named after a doppelganger, the ghostly double of a person.
Parasect is Controlled by Its Mushroom
Parasect's growth has been stunted by the mushroom that has resided on its back since birth. The mushrooms sink their spores into the host's brain, giving the parasitic mushroom total control over the Paras. Due to being possessed for so long, the eyes have whited out and the mushroom has drained almost all of the Parasect's life force, which gives the mushrooms the energy to grow into a gross exaggeration of its former size. Once they are that huge, they take total control of the Parasect's mind, creating a "hivemind" with other host Parasects. To ensure survival, the mushrooms force the Parasect to breed and once the eggs are laid, the mushrooms coat the eggs with their parasitic spores, ensuring their offspring will wind up in the same, dead-eyed and doomed fate they currently have.
The Legendary Beast's Origions
Electivire most looks like a Saber Tooth Tiger and Raikou is a Saber Tooth Tiger. They may share an ancestor. This theory is more plausible because they are both Electric type. It may be a 50% mix of the two. It may even have a bit of Persian.
They're the only two Lion Pokémon, excluding Solgaleo but that's from Ultra Space. It's appearance in Pokémon Generations before Ho-oh revives it makes it look more like a female Pyroar.
Mew's Second Clone and it's connections
There's a popular fan theory that Ditto is a failed clone of Mew. They have the same colours (I'm Irish btw) even when shiny, same weight and are the only two Pokémon to learn Transform (Without Hacks, obviously). However, Ditto may be related to the three Pokémon that are related to Garbage. First off, it was sewer cleaning day, and a few Dittos fell in. They became poisoned and then mutated. They lost the move Transform and gained new moves, becoming Grimer and later Muk. Some stayed in the sewer and became Sun Proof, but some went out. This was dangerous, and 50% of them evaporated but didn't die. They became Koffing and then later Weezing. The other 50% new they where evaporating so they hid in garbage and went into the bags, fusing with them and became Trubishes, and later Garbodors. However, unlike the other two, Garbodor has a Gigantimax form where it is shown with garbage. However, Grimer and Muk has Alolan forms that may have been due to berries. Alola is the most tropical reigion so there may be alot of berries that fell in and melted. They mixed with the slime and Alolan Grimer and Muk was formed. Weezing also has a Galarian form, but not Koffing. This is due to Koffing absorbing toxic waste and grew obtrusions that look like hats, gained the fairy type and turned Gray, with some Green toxic waste coming out.
Greavard is the ghost of Maschiff
There are several reasons why the Ghost Dog Pokémon Greavard could be the spirit of a dead Maschiff. First off, Greavard’s Pokédex entry in Scarlet reads this: “It is said that a dog Pokémon that died in the wild without ever interacting with a human was reborn as this Pokémon.” In addition, Maschiff and Greavard both evolve at level 30, but Greavard can only evolve at night. Furthermore, Maschiff and Greavard seem to possess extremely similar body types, though they do become more unique as they evolve. And finally, in the Naranja Academy (Scarlet) or Uva Academy (Violet), there is a book that recalls of the Gym Leader Ryme grieving her deceased dog Pokémon in the form of singing, and Ryme’s singing reportedly revived her Pokémon as a Ghost. In the Montenevera Gym, Ryme has a Houndstone (Greavard’s evolved form) on her team.
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