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Look at the difference between Kanto and Galar.
>Kanto has Viridian Forest, Mt. Moon, the S.S. Anne, Diglett Cave, Rock Tunnel, the power plant, Pokemon Tower, the rocket hideout, Silph Co., the Pokemon mansion, Seafoam Islands, Victory Road, and Cerulean Cave, most of which have multiple floors and half of which have some sort of (simple) puzzle
>Galar has Galar Mine no. 1, Galar Mine no. 2, Slumbering Weald, and Glimwood Tangle, all of which are hallways with a few trainers
What happened? I'm not trying to be a KANTOOOfag, it's more that RBY are the first games in the series, but they have a lot of dungeons.