Clair's my second favourite Johto Gym Leader for these reasons. She has always been one of the more memorable GSC characters for me because of how I really struggled to defeat her on Gold many years ago. And I like it when we see characters who are related.I enjoyed meeting and battling Clair the most. I thought her team was quite tough, especially since she was the first Dragon-type leader. I also thought it was cool how she was related to Lance.
My favorite gym leader is Falkner because he was one of the most memorable to me
Everyone hates her, but I'm a Whitney fanboy. She was cute and had a strong ace. Probably Johto's best Gym Leader over all.
Clair because she owned three Dragonair and a Kingdra, which are my favorite Dragon type Pokemon.