Pikachu (ピカチュウ, Pikachū) is a fictional creature in the Pokémon franchise of media. It is one of the most popular and well known Pokémon in the world, and is the main representative or mascot of the franchise and its anime. It appears as a playable fighter and starter in all three Super Smash Bros. games.
 Creature description
Pikachu is a small mouse-like Pokémon with short, yellow fur (with brown markings on the back), pointy, black-tipped ears, red circles on its cheeks, and a tail in the shape of a lightning bolt. The extensive variety of Pokédex entries available for Pikachu throughout the RPG series provides plenty of biological information: It lives in forests in groups away from people, and it keeps its tail raised as it monitors its surroundings. The tail is sometimes struck by lightning in this pose, and it will try to bite whatever yanks its tail. Its red cheeks are electricity-storing pouches which appear to become electrically charged overnight while Pikachu sleeps. It occasionally discharges electricity when it is dozy after waking up. Shooting out stored-up electricity from its cheeks is its primary offensive measure; if threatened, angered, or attacked, it discharges the electricity from its cheeks at the offender. When it releases pent-up energy in a full-on burst, the electric power unleashed is equal to a bona fide lightning bolt. When several Pikachu gather together, the collective electricity among them may build and cause a lightning storm. It occasionally uses an electric shock to recharge a fellow Pikachu that is in a weakened state. An intelligent species, it jolts any new thing it comes across as a way of inspecting it. Whenever it comes across a hard berry, it uses its electricity to roast the berry to make it tender enough to eat, and it jolts any new thing it comes across. If one was to come across a blackened berry, it is evidence that a Pikachu mistook the intensity of its charge.
In the main series of video games, Pikachu is a relatively weak Electric-type Pokémon that can be found early in the original game. Unlike certain special monsters that had plot elements wrapped around them (such as Mewtwo), Pikachu was just another Pokémon that could be caught, evolved into its higher form, Raichu, and had no bearing on the story. However, Pikachu's popularity in the animé, where it was the first and primary Pokémon of the main character, Ash Ketchum, eventually led to its starring its own specialized version of the Game Boy game (the Yellow version, which was largely based on the animé), as the first Pokémon that the player obtained. Pikachu's role in the game was intensely elaborated on, as several events on the game depended on how Pikachu felt towards the player. Depending on the player's actions towards Pikachu, the electric mouse Pokémon would exhibit a variety of emotions when spoken to, varying from frustration, to amusement, to complete adoration. Pikachu's happiness was sometimes a prerequisite for certain rewards in the game, such as attaining the three Pokémon that could be chosen as starters from the Red and Green versions.
Pikachu has not had a starring role in any of the main games in the series since then, but it has been featured in every prominent hand held RPG since the franchise, usually bringing something new with it each time. In Pokémon Gold/Silver, released for the Game Boy Color in 2000, Pikachu gained a new evolutionary phase in the form of Pichu. It also gained an item called the Light Ball, which doubled Pikachu's Special Attack when held. However the item was only obtainable when trading a Pikachu over from the Yellow version. The Emerald version of the Game Boy Advance games gave Pikachu an Egg Move exclusive to it and its family, called Volt Tackle, which was an exceptionally powerful Electric-attack with a large recoil. The Diamond and Pearl versions of the recently released DS title introduced cosmetic differences between genders for certain species of Pokémon, and Pikachu was one of them, with the females having a dent at the end of their tail. The Light Ball also gained a new feature in this game - allowing both Pikachu's normal and Special Attacks to be doubled.
Pikachu has also been in virtually every Pokémon-related spin-off game ever released, sometimes as the star or a main character, and other times just featured among the hundreds of other Pokémon in the series. Notable Pikachu-centric games include Hey You, Pikachu! for the Nintendo 64, where the player could talk to Pikachu using the microphone, Pokémon Channel, which is usually regarded as a spiritual sequel to the previous title, PokéPark Wii: Pikachu's Great Adventure that has Pikachu as the main character and the Pokémon Mystery Dungeon games, where Pikachu is one of 16 Pokémon that the player can start out as. Pikachu has also been made into a Tamagotchi-style virtual pet called the Pocket Pikachu, which was a little LCD device that owners can clip onto their belt. Whenever the user took a step, it would register on the system, which would give Pikachu points in the form of "watts". It is described as quadrupedal.
 In Super Smash Bros.
 As a playable character
 In Single-player
In the fifth level of the game's single-player mode, the player faces Pikachu on the Saffron City stage.
 In Super Smash Bros. Melee
 As a playable character
Pikachu returns to Melee, once again as a starter character. While its play style is still incredibly similar to its first appearance in the Smash series, Pikachu is not quite as deadly as it used to be. However, it's still a powerful, agile character and a force to be reckoned with, ranking 10th on the tier list in A tier. Pikachu gains Skull Bash as its new side special move.
 In single-player
In the game's single-player Adventure mode, a team of a total of ten Pikachu, Pichu, and Jigglypuff, face the player on the Pokémon Stadium stage, and the only items on the stage are Poké Balls. Pikachu is featured in the following Event Matches:
In line with the other playable characters, there are three Pikachu trophies obtained by defeating the single-player modes - a normal trophy from Classic Mode, and "Smash Red" and "Smash Blue" trophies from the Adventure and All-Star modes, respectively. The Classic mode trophy reads:
 In Super Smash Bros. Brawl
 As a playable character
Visually, Pikachu has barely changed at all from its Melee design, only being touched up slightly. However, Pikachu was improved from Melee, becoming more powerful in the process, and gaining many new techniques such as Quick Attack canceling and two chaingrabs. As a result, Pikachu is ranked 8th on the tier list in B tier. It has all of its moves from the first two games. Like the rest of Brawl's cast, Pikachu also has a Final Smash, a new kind of special attack that was added for Brawl. Pikachu's Final Smash is called Volt Tackle, which involves it turning into a giant ball of light that can be controlled by the player. One downside of Volt Tackle is that it can be considered hard to maneuver. This move operates absolutely nothing like Volt Tackle in the original Pokémon games, and is speculated to be based on a special ability in the Genesis/Mega Drive game Pulseman, Volteccer, which Volt Tackle was apparently based on and named after (in the Japanese versions of the Pokémon series).
 Trophy Info
 In Super Smash Bros. 4
Pikachu has been confirmed as a playable character.