Ummm. No. They weren't finished in the original G/S/C, and they aren't finished in HG/SS. These are remakes not the game ten years later or something stupid such as that. Also you battle the Gym Leaders again at certain spots, on certain days, at certain times. You would know this if you payed attention to updates about the game.
I just realized something.
That old man and his machop have to be finished with that building in Vermillion City by now.
I wonder what it will be? A battle club where you get to remach the Gym Leaders like in the survival area?