Earlier this week, the game pushed out a number of subtle tweaks in preparation for the game’s upcoming update. Included in those changes were some very minor changes to the models for Pikachu, Raichu, and Gastly.
Pikachu and Raichu’s bottom halves are both a bit more orange, while Gastly’s eyes changed from white to a very, very light blue.
Usually, this wouldn’t be a sign of anything, but some Pokemon Go players are convinced that more Shiny Pokemon are on the way. Similar changes were observed to the models for Magikarp and Gyarados shortly before Shiny versions of those Pokemon were introduced in March.