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8.
Pretty much the coolest Pokemon EVER.
You: Hey look...A Pikachu!
Me: Fuck! The one time I don't have my Pokeball...
by ~Chelsea Louise January 01, 2007
 
9.
Pikachu is an Electric-type Pokemon who's first appearance were in the Japanese video games Pokemon Red and Green (1996). His first appearance in the USA was in the similiar games Pokemon Red and Blue (1998). Contrary to popular belief, the Pokemon anime did not air before the games were released. Pokemon Red and Blue came out on September 1st, 1998, while the anime aired 7 days later on September 8th.

Pikachu's National Dex number is #25. He can evolve to Raichu via exposure to a Thunderstone. A baby form of Pikachu named Pichu was introduced in the Game Boy Color sequels to Red and Blue, Pokemon Gold and Silver (2000). Pichu is #172 in the National Dex, and could only be obtained by breeding a Pikachu or Raichu with another compatible Pokemon.

Pikachu's rise to fame stems from the fact the main character of the Pokemon anime, Ash Ketchum, is given a Pikachu by Professor Oak as a starter Pokemon.

In Pokemon Red and Blue, the protagonist Red could also obtain a Pokemon from Professor Oak, although his choice was limited to Bulbasaur, Charmander, and Squirtle (Pokemon which Ash caught during his quest).

The character Ash seems to based on Red in appearance only, as Red was a silent protagonist and didn't have a personality.

Soon after the anime began airing in America, Pikachu became the poster-boy of the Pokemon franchise. Easily the most famous of Pokemon, Pikachu is known by almost everybody in the world and appears on countless Pokemon merchandising.

In fact, Pikachu became so famous that he became a playable character in the Nintendo fighting game Super Smash Bros. (1999) for the Nintendo 64, along with fellow Pokemon Jigglypuff. Appearing alongside such famous Nintendo fighters as Mario, Link, and Samus Aran only helped propel Pikachu to the level of stardom that he now holds. Pikachu was top tier in the game, and was considered by many players to be the most powerful character in competitively play.

In the 2 year gap in between the release of Super Smash Bros. and its sequel, Super Smash Bros. Melee, Pichu also became a fairly popular character. He, alongside Pikachu, Jigglypuff and Mewtwo, became a playable character in Super Smash Bros. Melee.

Pichu was a "clone" of Pikachu (meaning he had the same moveset), but he was much weaker. He was a bottom tier character - in fact, he was at the very bottom of the tier list. Pikachu himself moved down from top tier to low tier.

Pikachu has already been confirmed for the upcoming release, Super Smash Bros. Brawl (February 10, 2008), but most believe that Pichu won't return due to him being a clone of Pikachu and being the worst character in the previous game.
What?! Pikachu is evolving!

Congratulations! Your Pikachu evolved into Raichu!
by Pimp Master R October 20, 2007
 
10.
a slang term for vagina, as seen on Chelsea Lately
She was caught flashing her pikachu.
by anonymarge April 18, 2009
 
11.
A slang word for vagina.
I am really tired of seeing her pikachu in the tabloids every time she gets out of a car.
by Kaslopiluffaguss January 16, 2009
 
12.
A fictitious animal in the world of Pokemon, It's name derives from the Japanese meaning: Electric Mouse. It's also the main character's favorite Pokemon.

Aside from that, Pikachu's Popularity made it a World Wide Icon and an official Icon to the Nintendo Company along with the other Prime Characters such as: Mario, Link, and Kirby.
Daniel:Over 10 years old and still running!

Noah: Yeah not to mention that every year Japan gives Pokemon a big tribute by parading around Tokyo with a Giant Pikachu Balloon.

Daniel: And don't forget that Pikachu is One of the Main Characters in the Nintendo Corporation... I Mean Just Look At the Smash Bros. series!
by Angel Rodriguez August 30, 2007
 
13.
The lead Pokemon character in the Anime of Pokemon. An electric mouse Pokemon.
It is described in different ways in different Pokemon games and are as follows:

Red/Blue: When several of these POKéMON gather, their electricity could build and cause lightning storms.
Yellow: It keeps its tail raised to monitor its surroundings. If you yank its tail, it will try to bite you.
Gold: This intelligent POKéMON roasts hard BERRIES with electricity to make them tender enough to eat.
Silver: It raises its tail to check its surroundings. The tail is sometimes struck by lightning in this pose.
Crystal: When it is angered, it immediately discharges the energy stored in the pouches in its cheeks.
Ruby: Whenever PIKACHU comes across something new, it blasts it with a jolt of electricity. If you come across a blackened berry, it's evidence that this POKéMON mistook the intensity of its charge.
Sapphire: This POKéMON has electricity-storing pouches on its cheeks. These appear to become electrically charged during the night while PIKACHU sleeps. It occasionally discharges electricity when it is dozy after waking up.
Emerald : It stores electricity in the electric sacs on its cheeks. When it releases pent-up energy in a burst, the electric power is equal to a lightning bolt.
Ash: Go! Pikachu!!

That Pokemon named Pikachu is soooo cute. =3
by I am some guy October 08, 2009
 
14.
Prisoner of Man. Pikachu is the only one of Ash's pokemons that has not evolved yet over the course of years the show has been on-air. It is infer that Pikachu isn't allowed the freedom to express his true self and venture out into the world because of Ash's strict restriction he has on him.
Matt: Living at home suck when I'm going to college. My parents treat me like I'm still a kid.
Drew: That sucks man, but just be glad your not a Pikachu!
Matt: Haha, your right. Anything is better than that!
by Abby_08 May 17, 2009