Amphibian Pokemon

“Pokemon can be classified by following criteria: A low reproduction rate (with the offspring being in most cases of its mother’s species), supernatural abilities like extended longevity (in some cases, as seen in the so-called ‘Legendary Pokemon’, it exceeds several thousand years), the ability to control different elements, large-sized bodies, a sudden second and third mutation/maturity stage, some of which are triggered by the radiation of different ores (and a newly-discovered fourth stage, the ‘Mega-Evolution’ which is triggered by ‘Mega Stones’), and near-human/superhuman intellect, even in animals like arthropods. It was generally believed that Pokemon where a whole different act of Creation, or even extraterrestrial life-forms.

In 1850 however, when a female West-Highland Terrier gave birth to a litter of Lillipups, people began to realize that Pokemon did come, in fact, from normal animals. This caused several theories to spring up until in 1976 the young Pokemon Professor Samuel Oak discovered a virus in one of his samples. First, he believed it to be a contamination, but then curiosity got the better of him. He noted a section in the virus’ DNA he found oddly familiar. In a sample of his Charizard’s DNA, he recognized the exact same section of viral DNA. This lead to a breakthrough in Pokemon research, explaining exactly where Pokemon came from: The ‘Pokerus’ Virus affects the reproductive organs, slipping its genetic information into its hosts gametes and changing the offspring to mutate into Pokemon.”

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Frogs and salamanders. Bet you didn't see that one coming.

EDIT 22.01.2023: Updated the main file to contain the 9th Generation.

Dreepy, Drakloak, Dragapult, Dracovish, Wooper, Paldean Wooper, Quagsire, Clodsire, Mudkip, Marshtomp, Swampert, Mega Swampert, Slowpoke, Slowbro, Mega Slowbro, Slowking, Galarian Slowpoke, Galarian Slowbro, Galarian Slowking, Lickitung, Lickilicky, Poliwag, Poliwhirl, Poliwrath, Politoed, Tadbulb, Bellibolt, Tympole, Palpitoad, Seismitoad, Geodude, Aloan Geodude, Graveler, Aloan Graveler, Grimer, Aloan Grimer, Muk, Aloan Muk, Stonjurner, Croagunk, Toxicroak, Froaky, Frogadier, Greninja

Notes:
-I will not make an Ash Greninja
-Grimer and Muk can survive in toxic conditions, becoming toxic themselves. Their Aloan counterparts' colorful appearance is to warn others.
-Geodude and Graveler are not related to Golem (which is a tortoise). Instead, Golem likes to hide its eggs among groups of Geodude in hibernation
-Poliwhirl grows different, depending on its surrounding. If it is wet, it will turn into Politoad, is it dry, it will turn into Poliwrath.
-Slowpokes that do not leave the water become Slowking.
-Galarian Slowpoke and relatives are afflicted with a strange disease that alteres the normal process of hardening that usually appears in its tail and might affect any other body part, mostly the front limbs, but it can appear in other areas as well and can be debilitating to lethal.
-Seriously, I will not make an Ash Greninja

PLEASE NOTE: This is how I see the Pokemon. It is fine to be of different opinion, but please tolerate mine.

See the
Plants
Other Invertebrates
Spiders and other Arthropods
Insects
Fish
Amphibians
Reptiles
Dinosaurs
Birds
Birds of Prey
Dragons
Therapsides
Dogs
Cats
Other Carnivora
Rodents and Rabbits
Other Mammals
Mew Double
Ungulates
Primates

Gen I
Gen II
Gen III
Gen IV
Gen V
Gen VI
Gen VII
Gen VIII
Gen IX