The Pikachu that has lost its ability to generate electricity is called Peakychu.
Peakychu is one of the special Pokémon encountered as Ditto restores habitats in Pokémon Pokopia. The character is based on Pikachu but has a distinctive story problem: it can no longer produce electricity. That detail gives the familiar Pokémon a role in the game’s broader theme of recovery and adaptation.
Pokopia’s special characters often receive names that reflect their altered circumstances or occupations. Mosslax is a Snorlax overgrown with moss, Chef Dente is a cooking Greedent, DJ Rotom possesses a stereo system, and Tinkmaster is a tool-using Tinkaton. Peakychu belongs to the same group of unusual named residents.
The name is easy to confuse with Pikachu’s standard species name because it preserves much of the original word. However, Peakychu is the specific character name used in Pokopia’s story. It is not the name of a new evolution or a general alternate species across the Pokémon series.