Where are all of the Gym Leaders and E4 members located upon completion of the game? I want to go find them all, but I don't know where to start looking.

So far I've found:
>Roxanne at the Fossil Maniac's home
>Brawly after defeating Lisia in Master Contest (available pre-E4))
>Wattson during the New Mauville quest (available pre-E4)
>Flannery in Scorched Slab (available pre-E4)
>Norman a few times throughout the game, including the talk with Wally's father and the Delta Episode beginning and end
>Winona on Mauville City's east tower
>Tate & Liza in the department store
>Wallace during the Delta Episode

>Phoebe near Mt. Pyre's summit
>Drake on the S.S. Tidal

Am I missing any other encounters?
Some of them, like the Norman encounters are required to progress, so I was wondering if there were others.