Pikachu

Description
Pikachu is an Electric type Pokemon and the first Pokemon of Ash Ketchum. If it feels it's in danger, it'll pop up its ears and tail. If that doesn't work, it will try Thundershock or even Thunderbolt if it knows how. It is a worthy ally if well trained.

Your friend, Joey, catches a Pikachu in Viridian Forest 2. Joey's Pikachu knows Thundershock and Thunder Wave so it is at least level 10. Although it is a starter for Ash in the Pokemon television series and for a player in Pokemon Yellow version, it is not an option as Starter Pokemon in Pokemon Tower Defense.

Evolution
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Location

 * Viridian Forest: 1%, Cutscene
 * Viridian Forest 2: 1.5%, Cutscene
 * Mt. Moon 1: Cutscene
 * Poke Tower 2: Joey's Pokemon
 * Daily Gift (with Egg Move)
 * Given in Old Rod (Challenge Level), but only for that level.

Shiny

 * Shiny Pikachu has a 0.0125% chance of appearing in the wild.
 * Pokemon Adoption: 1 SnD Coin (Common Shiny Pokemon)

Trivia

 * Pikachu is the only electric-type Pokemon to evolve with the Thunder Stone.
 * The other is Eevee, which is a Normal-type Pokemon.
 * Currently, Ash Ketchum's Pikachu has not made an appearance.
 * In Cerulean Gym 2, Joey wants to give Ash his Pikachu.
 * In Poke Tower 2, Joey helps you by having his Pikachu use Thunder Wave.
 * There are multiple Pikachu visible in the opening title. They are
 * Surfing Pikachu
 * Flying Pikachu
 * Regular Pikachu
 * Pikachu used to be one of the Pokemon given in the Multiplayer level, however it is not anymore.