What are the names of all Hoenn gym leaders?

Here are the names of all the Hoenn gym leaders, along with their type specializations:

* Norman (Petalburg City): Normal

* Brawly (Dewford Town): Fighting

* Flannery (Slateport City): Fire

* Winona (Fortree City): Flying

* Tate & Liza (Mossdeep City): Psychic (dual leaders)

* Juan (Ever Grande City): Water

* May (Lilycove City): Fairy (only in the Omega Ruby and Alpha Sapphire games)

* Wallace (Sootopolis City): Water