Pikachu#25
Versions: Blue and Red
Type: Electric
Attacks: -Thundershock -Growl Thunder Wave lv9
Quick Attack lv16 Swift lv26 Agility lv33 Thunder lv43
Evolutions: Pikachu-> Raichu Thunder Stone
Area: Viridian Forest and the Power Plant.

Raichu#26
Versions: Blue and red
Type: Electric
Attacks: Once you evolve Pikachu into Raichu it can't learn any more attacks besides HMs and TMs.
Evolutions: None
Area: Victory Road, the Unknown Dungeon, and the Power Plant.

Voltorb#100
Versions: Red and Blue
Type: Electric
Attacks: -Tackle -Screech Sonic Boom lv17 Self Destruct lv22
Light Screen lv29 Swift lv36 Explosion lv43
Evolutions: Voltorb-> Electrode lv30
Area: Route 10 and the Power Plant.

Electrode#101
Versions: Red and Blue
Type: Electric
Attacks: -Tackle -Screech -Sonic Boom -Self Destruct
-Light Screen Swift lv40 Explosion lv50
Evolutions: None
Area: Cinnabar Island, the Unknown Dungeon, and the Power Plant.

Electabuzz#125
Versions: Red
Type: Electric
Attacks: -Quick Attack -Leer Thundershock lv34 Screech lv37 ThunderPunch lv42 Light Screen lv49 Thunder lv54
Evolutions: None
Area: Power Plant

Jolteon#135
Versions: Red and Blue
Type: Electric
Attacks: -Tackle -Sand Attack Quick Attack lv27
Thundershock lv31 Tail Whip lv37 Thunder Wave lv40
Double Kick lv42 Agility lv44 Pin Missle lv48 Thunder lv54
Evolutions: None
Area: Evolve from Eevee.