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Summary
Wanted to point out 2 more sport things that could be hinting at a possible Sport Competitions. Both Grant and Korrina's gyms were both very Sport like. We basically had a Roller Dirby Gym for Korrina and we had Rock Climbing for Grant.

Now it is possible that these stadiums could be gyms, but with a Sport theme similar to Grant. Ash had to climb the rock walls in order to get to Grant if I remember correctly. It is also possible that these Stadiums could sever as a dual purpose for Competitions and Gyms. Honestly reading this gave me an Orangue League feel, when Ash had to do certain things to get some of the badges (rather than just battling the Gym Leader). I think it'd be interesting if Galar's Pokemon Gyms were a mix between Orange Island and normal gyms. There's two phases (kinda like how GRant's had "two phases") in which the trainer has to do something and win before they can fight the gym leader in question.

idk just a thought that would be a nice twist from your typical gym battles. And the fact that the gyms were different in Orange League is part of why that arc is so unique.