Gym Leaders are tough trainers that are required to progress through the game, gyms increase in difficulty as you progress and each gym leader will reward a badge upon defeat. Once you have beaten all 8 Gym Leaders, they can all be re-battled at Elegant Valley along with Johto Gym Leaders.
Pewter City Gym
Gym Leader: Brock
Specialty: Rock Type Pokemon
Badge: Boulder Badge
Cerulean City Gym
Gym Leader: Misty
Specialty: Water Type Pokemon
Badge: Cascade Badge
Reward: Level 10-20 Togepi
Vermilion City Gym
Gym Leader: Lt.Surge
Specialty: Electric Type Pokemon
Badge: Thunder Badge
Note: This is a often missed Gym Leader. Once you get to Vermilion City Poke Center, go all the way down until you see the giant yellow-top building, and you will see the GYM.
Celadon City Gym
Gym Leader: Erika
Specialty: Grass Type Pokemon
Badge: Rainbow Badge
Fuchsia City Gym
Gym Leader: Koga
Specialty: Poison Type Pokemon
Badge: Soul Badge
Koga's Pokemon:
- Weezing Lvl. 47
- Venomoth Lvl. 47
- Arbok Lvl. 50
- Muk Lvl. 53
- Gengar Lvl. 57
Saffron City Gym
Gym Leader: Sabrina
Specialty: Psychic Type Pokemon
Badge: Marsh Badge
Sabrina's Pokemon:
- Mr. Mime Lvl. 55
- Kadabra Lvl. 55
- Hypno Lvl. 57
- Venomoth Lvl. 59
- Haunter Lvl. 59
- Alakazam Lvl. 65
Cinnabar Volcano Gym
Gym
Gym Leader: Blaine
Specialty: Fire Type Pokemon
Badge: Volcano Badge
Blaine's Pokemon
- Rapidash Lvl. 65
- Ninetales Lvl. 66
- Flareon Lvl. 67
- Charizard Lvl. 70
- Magmar Lvl. 71
- Arcanine Lvl. 73
Viridian City Gym
Gym Leader: Giovanni
Specialty: Ground Type Pokemon
Badge: Earth Badge
Use level 85 and under pokemon to stop him from copying your pokemon. Mewtwo will be his final Pokemon.