Pachirisu can not evolve at all in any of the Pokemon games.
Directly from http://bulbapedia.bulbagarden.net/wiki/Pachirisu_%28Pok%C3%A9mon%29 : "
Pachirisu (Japanese: パチリス Pachirisu) is an Electric-type Pokémon introduced in Generation IV.
It is not known to evolve into or from any other Pokémon. "