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Mine's 'Terrence' (yes it's a pun)
The youngest Gym Leader in his home region, specialising in Ground-types. His strength in battle is unnatural for his age because his father was the previous Gym Leader of his town, retiring from that role after serving in it for over three decades, and even serving a brief stint as Champion. His dad was a Fire-type specialist, so he started raising a Sand-based team to counteract it, then grew to love his squad too much to swap them out. Besides his four Gym Pokémon - Sandaconda, Claydol, Mudsdale and Garchomp - he also owns a Heliolisk and Gigalith he used in his Sand team before making Gym Leader, and still uses them in unofficial matches.
I've never had a ref of him, so pic related is my attempt to recreate him in SwSh, the glasses being the only part not accurate to what I had in mind for his design - instead, they'd be protective goggles, but this is the best I could do.