Aromatic Mist
Sensuble
Hey at least Kanto didn't have an Ice Gym.
Unlike Electric and Water which have 6 and 7 Gym Leaders each
Don't you mean 5 (Vermillion, Mauville, Sunyshore, Nimbasa, Lumiose) for both? (Cerulean, Sootopolis, Pastoria, Striaton, Humilau)
Or are you counting one more for water because Juan? To be fair, he wa just the exact same Gym with a different leader. And at least Water has moved around a bit. I mean:
Electric is mostly around the mid game:
Vermillion: 3rd
Mauville: 3rd
Sunyshore: 8th (outlier)
Nimbasa: 4th
Lumiose: 5th
Pretty static, right?
Whilst water is a bit more fluid:
Cerulean: 2nd
Sootopolis: 8th
Pastoria: Meant to be 4th or 5th, but can be done 3rd or 4th
Striaton: 1st (If you picked tepig)
Humilau: 8th
Tbh, I think we're already doomed to have a Water Gym, the resort/hotel in the trailer has a banner with Water-Types on it.