Keeping the conversation about female champions, Nemona is probably my favorite character in the entire Pokémon franchise because I love her personality. She is a great friend to your character, sincerely wants you to perform at your best, is very cheerful, and extremely competitive. Her team is also pretty good and she was aware enough to pick the starter whose secondary typing has an advantage over yours, which differs from a rival like Hau. However, even though Nemona might as well be the "true" champion of the Paldea region, the truth is that Geeta is still considered the "actual" champion despite not being the final boss. Thus, if Nemona doesn't count, then I would say that Iris is my favorite female champion. She has a strong team, is actually somewhat challenging on Challenge Mode, gets involved in the story by helping you out in certain instances, and of course, climbs up in the ranks despite her age. She is easily the youngest Pokémon champion, which is commendable. The most overrated is definitely Cynthia.
She has a reputation for being the most difficult to beat, even to the point of becoming a meme, but she's really easy to defeat and has a bad team. She literally has like five special attackers on her team, including a specially attacking Lucario, which is simply not better than physical Lucario, and Garchomp is her only physical attacker. Yet, many of her Pokémon on her team also have a weakness to Ice-types. She can also be easily stopped in her tracks by simply walling most of her Pokémon with a specially defensive Pokémon. Yet, despite all this, people are somehow losing to her. Lol As for the worst, that title belongs to Diantha. Not only does she not get involved in the story at all, but her team is also horrible and she was ridiculously easy to beat. As for Geeta, I am completely neutral on her. She gets a lot of hate for supposedly having a bad team, but let's be honest, no champion truly has a good team. The only champion that I can say has a good team is Blue, which could actually make for a really good meta team during its time. It's literally structured perfectly like a great team should be.