I don't particularly care for Sinnoh Gym Leaders in general.However,Candice looks cute and I like her energetic personality.Weavile is also my favorite of Ice-types.In Platinum,I often have trouble with her in rematches because of Snow Warning+Snow Cloak+Blizzard combination though.
Crasher Wake. First, he is a wrestler. Second, He battles for fun. And lastly, He is a water type gym leader. And water types are my favorite. If I had to pick a second, it would be byron, because HE LOVES DEFENSE!!!! (insert Explosion Here)