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I like how every Pokemon city and town has its own feature, or a tourist attraction, I think that's what gives them a sense of traveling.
Having said that, I'd say HG/SS were my favorites, I was quite impressed with the Bellsprout Tower in Violet City having one of those central pillars that are in actual Japanese temples to prevent earthquakes. Goldenrod City is also probably the most chill place to look around.
Erika is my favorite Gym leader, and I love that you can rematch her with a stronger lineup, along with the other Gym leaders.