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In a big city, probably the second or third gym.
You go into the sewers and most of it is shoddily blocked off making a maze. The correct path leading to the gym has trainers on it (not explicitly said but they're placed on it, just for people to work it out).
You reach the end of the maze and come out of the sewers to a back street with a gang hideout. The leader of the gang is the gym leader who runs a poison team. Their general strategy is for Eviolite Mareanie to set up Toxic Spikes and for the rest of the team (and maybe Mareanie if it lives) to go for Venoshock.
