Eevee is a weird cat thing with screwed up DNA. It evolves into Vaporeon, Jolteon or Flareon depending on what Evolution Stone is used on it. Eevee passed through hard times when he became addicted to berries. Then people started hating him and nobody wanted him, so one day he went to Pokémon Red, and plead MissingNo for help. MissingNo helped him creating a Pokémon named Pikablu so people would get confused and Eevee could get in their minds. Two years later, the love for Eevee came back but in one of the experiments of how to get in peoples mind failed causing an explosion. That created mutant and ugly Pokémon now known as Garbodor.
Eevee's evolutions came about when Eevee came back to MissingNo and needed help to defeat the Great Garbodor. King MissingNo gave Eevee the power of fire to defeat it. After failing, Eevee decided to go to Pokémon Blue and visit Glitch City. Eevee asked Nurse Joy to help him defeat the Great Garbodor, so Joy gave him a Squirtle. As Eevee and Squirtle walked out of Glitch City, Giovanni trapped them in a hole. With nothing else to do, Eevee and Squirtle fucked each other. As Squirtle's penis entered Eevee, an energy was released that blew them out of the hole. Suddenly, Vaporeon was born. Once again, they failed to defeat the Great Garbodor. Eevee then travelled to Vermillion City in Pokémon Yellow and visited Lt. Surge. The same thing happened, except with a Pikachu, and Jolteon was born. They, again, failed to defeat the Great Garbodor, and to this very day, Garbodor still wrecks shit.
Screw you Darwin, this Pokémon proves that Arceus exists and created everything.