Power Up
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Honestly it doesn't matter that much if there is traveling or not. The underdevelopment of the SM cast is not due to the fact that they aren't traveling, but rather because 1.There is literally no progression in some of their goals and 2.Most of the episodes that are focused on a certain character comes out to be shallow or has no development. A series where Ash stays in one place for the majority of the time can theoretically work, however SM is not a good blueprint to go off of. The thing that SM desperately needs is a refined goal with a defined progression, such as Gyms and Contests. You can easily do that with a stationary setting with the companions traveling to different areas once in a while.
This. Traveling isn't the problem. Just shoddy writing. SM has a lot of that.