Which Kanto Gym Leader battle was the most challenging in Pokémon Red and Blue?

Kanto Region
Pokémon Red and Blue
Pokémon
Games
Kanto Region poll options
Kanto Region
Pokémon Red and Blue
Pokémon
- Brock's Rock-type Pokémon
- Misty's Water-type Pokémon
- Lt. Surge's Electric-type Pokémon
- Sabrina's Psychic-type Pokémon