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Takes place in a research facility where they try to figure out antidotes to pokemon venoms. Trainers are scientists, and other trainers have pokemon like grimer and koffing, but the gym leader exclusively uses animals that he studies.
For the gym puzzle, there's a sick pokemon and you have to combine a bunch of chemicals correctly to make the right antidote for it using only vague and puzzling directions as a recipe. When your battle with the leader is over, it's revealed that the pokemon was never poisoned and it was all just a test of your scientific abilities.