Quoted By:
All right, so by now, we all know why Mimikyu is disguised as Pikachu- because it's lonely, and it knows that Pikachu is super popular, popular enough to have a ton of merchandise flying around not just the real world but the Pokemon world as well, while it's not nearly as loved. In addition, it hates bright lights, hates people looking at it even more (either the sight itself, or Mimikyu's anger, killing any who peek beneath the veil), and according to the Anime, its mimicry of Pikachu does not mean that it likes the electric rodent at all- it instead hates it with a burning passion.
In addition, Mimikyu in its current form have to be a recent phenomenon, since the Pikachu merch their costumes are patterned after have only existed for the past 20 years. However, EVERY SINGLE MIMIKYU EVER- whether it be in-game, in the anime, or anywhere else- is patterned after Pikachu. Despite all the fanart, there are no holdovers from an earlier time, where Mimikyu would have disguised itself as something else- meaning Mimikyu itself is relatively new. Or... is it?
I submit for your delectation a hypothesis... Mimikyu is, in fact, the ghost of a dead Porygon, Porygon2, or Porygon-Z. Think about it- Porygon has a very valid reason to be lonely and to hate Pikachu, Electric Solder Porygon. That was an episode of the anime where Porygon held a title slot, where Pikachu's Thunderbolt- a bright, flashing light- caused hundreds of innocent Japanese children- and later, when the relevant clip was shown on the news, even more innocent Japanese adults- to be hospitalized for seizures due to simply seeing it, causing not just every instance of Pikachu's Thunderbolt to be darkened from then on, even outside Japan, but causing Porygon itself, as well as both of its evolutionary relatives, to never, ever be seen from then on in the anime, except for very, very recently- and then, only in tiny cameos.
(cont)