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The lagoon feels much more at home here than in the shadow of Mt. Moon. As the Power Plant is closer to Cerulean, I've settled on switching the gyms between the two.
The yellow brick path in the center is going to be a sort of small free market (berries, held items, non-standard balls, friendship increasing items, etc.)
Note the trucks behind the Mart; in a hack you wouldn't normally be able to get to the truck without already having a cut-knowing mon and putting off the Anne until you had Surf. No Mew behind it, probably the Lava Cookie or something.
I feel the trucks help flesh out Vermillion as an import/export town given its proximity to Saffron and Celadon.
Mr. Pokemon and the Fishing Guru remain.
I've made an effort to make the sandy shore and the rocky shore not clash together by transitioning from the pier.
Fun world-building trivia: Vermillion Bay is a national Corsola sanctuary.