1591. Pikachu

Pikachu (Japanese: ピカチュウ Pikachu) is an Electric-type Pokémon introduced in Generation I.
It evolves from Pichu when leveled up with high happiness, and evolves into Raichu when exposed to a Thunderstone.
Pikachu is popularly known as the mascot of the Pokémon franchise and a major representative of Nintendo's collective mascots.
It is the version mascot of Pokémon Yellow, where it is the only starter Pokémon in that game, and has made numerous appearances on the boxes of spin-off titles.

Exclusive to Pikachu is the ability to release electric discharges of varying intensity, at will, through electric sacs in its cheeks. This electric energy can be manipulated into a variety of techniques which are mostly used in battle, but which can be used to roast berries as well.
As Pikachu builds up energy in its electricity glands, it often needs to discharge, as to not result in a short, or worse, which can lead to physical Paralysis, or in severe cases, death. Pikachu release the built-up energy through their tail, which acts as a grounding rod, to safely remove unneeded energy. A sure sign to tell if a location is inhabited by Pikachu is to look for patches of burnt grass, which is the result of the discharge. Through an inability to release a buildup of electricity, a Pikachu may develop a rare condition similar to the human flu. This illness is most often caused by strong nearby electromagnetic forces, which severely impact the electric glands. If a Pikachu is introduced to a magnet, it will be attracted towards its cheeks, and display other common attributes of magnetism.
Pikachu and its evolution family, Pichu and Raichu, are the only known Pokémon that can learn Volt Tackle. In a few rare cases, Pikachu can learn to manipulate Water and, with the help of a surfboard, perform the move Surf. Other rare cases show that Pikachu can also learn, with the use of balloons, to perform the move Fly. Pikachu also have their own signature held item - the Light Ball. This item boosts a Pikachu's Attack and Special Attack stat, and, when held by a Pikachu in the daycare center, causes the offspring to know the move Volt Tackle.