The unusually pale Pikachu in Pokémon Pokopia is named Peakychu.
Peakychu is one of Pokopia’s unusual named Pokémon characters. Nintendo describes it as an unusually pale Pikachu, giving the familiar mascot a ghostly and striking appearance within the game’s restored-world setting.
Peakychu is not the same thing as an ordinary Pikachu with a temporary color effect. The name identifies a specific Pokopia character, just as Mosslax identifies the game’s moss-covered Snorlax and Smearguru identifies its prolific painter based on Smeargle.
Pikachu is one of the franchise’s best-known Pokémon and has been the series mascot since the original games. Pokopia uses that familiar species in a more mysterious form, helping reinforce the game’s theme of a world changed by abandonment and natural overgrowth.