That's not because of graphics. It follows the story of the old Gold/Silver games, who had "bad" graphics but still had the pokémon tower rebuilt into a radio tower.
As for myself, my favorite pokémon games when it comes to graphics are the first Johto ones. G/S/C. It's simple and pixely, but it is colorful and tempting in some strange way. It might just be nostalgia, but I have always loved the sprites and environments from those games the most. Part of what makes Johto my favorite region.
I completely forgot they did that in G/S, it's been too long; it really has.
I LOVE the music in Gen III, it's gets me hype every time.