Red's Pikachu

Red's Pikachu (Red's Pikachu) is the starter Pokemon received by Red when he began his Pokemon journey. Pikachu has a very rambunctious personality, very similar to David's Pachirisu, liking to shock its trainer playfully. But it's serious when it needs to be, often becoming a powerhouse in any major battle.

History
As told by Red to John, he first received Pikachu from Professor Oak on his tenth birthday in Pallet Town of the Kanto region. Pikachu didn't like him at first, often electroucting him in a way to harm him. Following some intense trials and tribulations, the two became very close friends, and share a unique bond between trainer and Pokemon.

Pikachu is Red's main battling Pokemon, used in nearly every battle. Pikachu, due to years of training, is more powerful than it should be as a species, as noted by Professor Rowan at Spear Pillar.