Pikachu is the Pokémon that becomes Peakychu after losing its ability to generate electricity in Pokémon Pokopia.
Peakychu is a special character encountered during Pokopia’s story. The name is a variation on Pikachu’s name, and the character’s problem is central to its identity: this Pikachu can no longer produce the electricity normally associated with the species.
Pikachu is an Electric-type Pokémon first introduced in Generation I and is the best-known mascot of the Pokémon franchise. Its electrical abilities are a familiar part of the character, which makes Peakychu’s condition an especially recognizable story detail.
Peakychu is not a separate species or an evolution. Raichu is Pikachu’s evolution, while Emolga and Dedenne are different Electric-type Pokémon. In Pokopia, Peakychu is a named individual based on Pikachu.