Agatha, Elite Four

Agatha is the third member of the Elite Four in Pokémon Red and uses Ghost-type Pokémon: Gengar (Lv 56), Golbat (Lv 56), Haunter (Lv 55), Arbok (Lv 58), and Gengar (Lv 60). Best counters: Psychic, Ground, and Ghost moves.

Agatha's team

Pokémon	Level	Type	Moves
Gengar	56	Ghost Poison	Confuse Ray, Night Shade, Hypnosis, Dream Eater
Golbat	56	Poison Flying	Supersonic, Confuse Ray, Wing Attack, Haze
Haunter	55	Ghost Poison	Confuse Ray, Night Shade, Hypnosis, Dream Eater
Arbok	58	Poison	Bite, Glare, Screech, Acid
Gengar	60	Ghost Poison	Confuse Ray, Night Shade, Hypnosis, Dream Eater

How to beat Agatha

Gengar is weak to Ground, Psychic, and Ghost. Golbat is weak to Electric, Ice, Psychic, and Rock. Haunter is weak to Ground, Psychic, and Ghost. Arbok is weak to Ground, Psychic, and Bug. Gengar is weak to Ground, Psychic, and Ghost. Bring Pokémon around level 63 and stock up on Full Restores: there's no healing between the Elite Four battles.