Agatha is the "Ghost" type elite 4 member in the games Red, Blue, Yellow, Fire Red, Leaf Green, Let's Go Pikachu & Let's Go Eevee. Where Agatha's team in Red, Blue, Yellow, Fire Red & Leaf Green is Gengar, Golbat, Haunter, Arbok & Gengar, which as you can see, it's a full team of Poison types, yet Agatha is the Ghost type elite 4 member, so that is why I chose to put Ghost in quotations, since Agatha may as well be more known as a Poison type trainer than a Ghost type trainer, but for Agatha, I can also understand why, since in Kanto, the only ghost types are with Gastly, Haunter & Gengar, so that's why I didn't let that affect my ranking with Agatha compared to some other members I've already talked about. Then Agatha's team in the Let's Go games consists of Gengar, Golbat, Arbok, Weezing & Gengar. So for both her teams, just bring an Alakazam or a different Psychic type and you can easily defeat Agatha's team no matter which Kanto game you play. However, I absolutely love the character design of Agatha, probably one of my more favorite character designs of all the Kanto region people. I ended up ranking Agatha out for 8th though, because I feel the teams definitely weighed her down quite a bit, and she's not really a tough elite 4 member to beat.
Members Left:
Lorelei
Karen
Shauntal
Grimsley
Caitlin
Olivia
Acerola
Coming in at #8 on my ranking is: