This section temporarily contains information copied directly from Bulbapedia, and needs to be rewritten so not to be classified as plagiarism.
Raichu is a bipedal, rodent-like Pokémon. Raichu is covered in dark orange fur with a white belly. Its arms and feet have patches of brown fur at the end, and the soles of its big feet are tan with a circular orange pad. Its bifurcated ears are brown on the outside and yellow on the insides and ends in a distinctive curl. The electric sacs on its cheeks are yellow. It has two horizontal brown stripes on its back. Its long, thin tail has a lightning bolt shaped end. This lightning bolt is smaller on females. Its tail is used to gather electricity from the atmosphere, or it can be planted in the ground to search for electricity. Its tail also serves to protect itself from its own power.
Raichu exudes a weak electrical charge from all its body and slightly glows in the dark, and is capable of storing over 100,000 volts of electricity. However, it will become aggressive if it has stored too much electricity. To keep from reaching this state, it discharges electricity through its tail into the ground. This leads to scorched patches near its nest. If Raichu’s sacs are fully charged, its ears will stand straight up and its muscles become stimulated. Raichu is found in forests and woodlands.