Elite 4 From All Regions

Kanto

Lorelei - Ice
Bruno - Fighting
Agatha - Ghost
Lance - Dragon
Blue/Gary - Various

Johto

Will - Psychic
Koga - Poison
Bruno - Fighting
Karen - Dark

Hoenn

Sydney - Dark
Phoebe - Ghost
Glacia - Ice
Drake - Dragon
Steven - Steel -R/S
Wallace - Water - E

Sinnoh

Aaron - Bug
Bertha - Ground
Flint - Fire
Lucian - Psychic
Cynthia - Various

Unova

Shauntal - Ghost
Grimsley - Dark
Caitlin - Psychic
Marshal - Fighting
Alder - Various


If you notice, all types of pokemon are used for each one. That is except for Electric, Flying, Grass, Normal and Rock.
I think i'll incorporate that in my region. We will replace my electric gym leader with a water gym leader so the electric one can be, and Airik will be replaced by Drako.

Elite 4 Members of Nuvonaire
Electric - Elaina
Flying - Airik
Grass - Unknown
Normal - Nora

Current Elite 4
Sarice
Nora
Willow
Drako

This idea is a beta idea. I don't know if this change will actually happen at all yet or not.