By leveling up:
* Thunder Shock: (Level 1)
* Tackle: (Level 1)
* Tail Whip: (Level 1)
* Quick Attack: (Level 5)
* Thunder Wave: (Level 10)
* Thunder: (Level 16)
* Double-Edge: (Level 22)
* Pin Missile: (Level 28)
* Thunderbolt: (Level 34)
* Agility: (Level 40)
* Discharge: (Level 46)
* Swift: (Level 52)
* Zap Cannon: (Level 58)
By TM/HM:
* Thunder Fang: (TM25)
* Substitute: (TM10)
* Light Screen: (TM43)
* Reflect: (TM44)
* Thunderbolt: (TM24)
* Thunder: (TM35)
* Protect: (TM35)
* Hidden Power: (TM36)
By breeding:
* Thunder: (Eevee)
* Thunderbolt: (Eevee)
* Thunder Wave: (Eevee)
* Quick Attack: (Eevee)
* Agility: (Eevee)
* Pin Missile: (Eevee)
* Double-Edge: (Eevee)
* Swift: (Eevee)
Note: Some moves might be unavailable in Pokemon Red due to the limitations of the game's movepool.