Raichu

Raichu is an electric-type Pokemon from the Generation I, it evolves from Pikachu when giving a Thunder Stone and it is the third evolved form of Pichu.

Physiology
Raichu is a rodent-like Pokémon, similiar to his previous evolutions forms. Unlike Pichu or Pikachu, which have yellow fur, Raichu has orange-brown fur. It has long ears and feet, but has stubby arms with no noticeable fingers

Cooking Up a Sweet Story
A Raichu named Sugar owned by Abigail evolved from a Pikachu. It helped rescue Ash's Pikachu from Team Rocket. It used Focus Punch to break into the mecha exterior and grab Pikachu's cage. Then used Thunderbolt to destroy the machine and send Team Rocket blasting off.