I looked around for this and I found none, so here goes. Due to the ongoing month, I'll be making some Whitney-centric match-ups.
Whitney, the incredibly pretty girl, Gym Leader of Goldenrod City.
Norman, a man in pursuit of power, Gym Leader of Petalburg City.
Aloe, the natural-born mama, Gym Leader of Shippou City.
All the Normal Type specialists are here for a showdown of regular proportions! They're well known as some of the hardest Gym Leaders in the series due to Normal being a rather difficult and solid Type to deal with. They're also quirky characters with plenty of personality, all focusing on different aspects.
I really like them all, but I have to pick Whitney. She's my favorite character and girl, not just in Pokémon, but in everything ever. She was also the first Gym Leader that gave me any difficulty, and she remains a tough opponent to this day. I gained huge respect for her ever since I played Gold for the first time, 10 years ago, and I really love her in every way. She's also the cutest and best looking out of the three. I'll put a multiple choice poll, but I have to stick for my love, Whitney ~ <3