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No puzzles in the gym, rather a gauntlet of pre-leader trainers attacking the player one after another with no healing in-between to simulate desert attrition. You'd get healed after the last trainer so that you're not gimped for the leader battle.
Gym leader would be an unabashed rip-off of Clint Eastwood from TGTBTU.
Ultimately the strat would be to maintain a sandstorm the entire match, abuse sand attack, sand veil, and double team to make my pokemon untouchable, dick move I know
