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

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