>>390903134th gym poison, Antidote Badge.
Gym leader Clara, a poison specialist that seeks to mend the image of poison types and uses their toxins to create medicines, when defeated hands over the TM for Venoshock and a store with an old lady starts selling you bitter medicines as a proof that you bested her daughter in training.
>Trubish lv 26 (Stench) @ quick claw
Sludge
Toxic spikes
Protect
Rock blast
>Koffing lv 26 (levitate) @ normal gem
Venoshock
Smokescreen
Self destruct
Toxic spikes
>Swallot lv 28 (Sticky hold) @black sludge
Venoshock
Protect
Bodyslam
Shadow Ball
Basically a poison gym the layout is a center gate with 4 vials and 2 roads to each side with 2 trainers each for 4 trainers total.
The left path has one Youngster using Stunky, Trubish and Grimer at 23 and a spastic Pokemaniac using Nidorina and Nidorino at 25, when defeated he complains about being unable to find moonstones and that's why you beat him.
The right path has a bug Trainer using Whirlipede, Venonat and Beedrill at 23 and a final lass with a sassy attitude using Weepinbell and Gloom at 25, when defeated she complains about not finding a leaf stone and that's the only reason why you beat her.
The puzzle is about retrieving a sample of poison from each trainer to mix it up in the middle of the room and open the gate to the leader.
I kinda like this concept, mixing toxins that each trainer hands you to create a solution to face a gym has always been a favorite idea of mine, having Swallot as the stomach Pokémon being used by a Doctor gym leader sounds cool to me.
