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Seeing as though the topic of the E4 i'll post my idea
As you should know, the Gym Guide has been a part of every game since the first generation but he doesn't really have any purpose other than to give advice or share healing items. My idea is we use this character for the Final of the Elite 4. His reasons for being at the gyms could be to track and analyse upcoming trainers in the region in order to prepare for their eventual battle. His look may not resemble a champion but I feel that it's a good idea and I think it would be great if he did a 'liquid snake' type hide of appearance or even a literal 'this isn't my final form' type change of appearence
Regardless of how it is done though, I think their is a lot of potential in this idea.