Nekagi
Eevee Fan
So...
"Even Pokémon researchers don’t know why Raichu’s form changed in the Alola region. The people of Alola seem unconcerned by the question. Their guess: maybe it ate too many sweet and fluffy round pancakes!"
GF probably gave it a form just for the heck of giving Raichu some love.
A few years ago, I drew a picture of Raichu crying over why it's not as popular as its pre-evolutions. We all probably wanted it to have a Mega Evolution ever since those were first mentioned, but it didn't happen. However, as of this year, it seems I stand corrected. Not only do we have its fascinating Alolan form, it also placed #71 out of 720 on a poll tie-in for the Volcanion and Magearna movie, as well as getting a Winking variation in Pokémon Shuffle (albeit with an ability inferior to Winkachu's)!