Quoted By:
Idea for the gym would be that it's located in a shitty run-down amusement park located on the outskirts of the city and the Gym is in essence an abandoned haunted house ride, where the player needs to navigate the blocked off areas by finding secret passages that get into the behind the scenes parts of the ride, some of the secret passages requiring the player to find hidden switches. Gym Leader would be found on the top floor of the ride and would greet the player before they enter from a balcony on the outside of the gym.
Gym Trainers would be a combination of Punks, PkmnManiacs and Hex Maniacs using Pokemon based on the number of badges the player has (note: Gym Trainers would be able to use Pokemon from lower badge numbers).
> 0 Badges
Poochyena, G. Zigzagoon, Purrloin, Nickit
> 1 Badge
Murkrow, Scraggy, Sandile, Impidimp
> 2 Badges
Mightyena, Zorua, Vullaby, Thievul, Stunky
> 3 Badges
G. Linoone, Liepard, Sableye, Krokorok
> 4 Badges
Pawniard, Morpeko
> 5 Badges
Zoroark, Morgrem, Skuntank
> 6 Badges
Spiritomb, Deino, Honchkrow, Scrafty
> 7 Badges
Drapion, Krookodile, Mandibuzz, Bisharp, Zweilous
The Gym would also be littered with Dark-Type Pokemon that ambush the player in hordes, the player can avoid these hordes by tampering with their ambush spots beforehand but this also requires the player to be observant of their surroundings since the Pokemon would spring out from furniture and decorations around the Gym.