Theme: Correctional facility.
Trainers heavily abuse status effects in the gym such as Twave, Swagger, Taunt. Later fights introduce the usage of Substitute, Punishment and Power Trip.
The gym layout would be like a prison, with dug-out tunnels connecting each of the rooms. Branching paths akin to Petalburg determine and allow you to choose which crime to deal with.
Leader's whole shtick is repentance, and how building yourself up (Power Trip) eventually leads you to getting knocked down even harder (Punishment). Spiritomb is there to represent the culmination of sins or whatever.
I tried to pick out mons that represent generic crimes (identity theft, mafia, etc.)
I know the badge is shit. Sue me.>>31318052This is weird and I like it. Hypno is cool.
>>31318197Timed events are good, I really wish there was more post-activity with a lot of gyms in the series.
>>31322862Generic theme, but the team looks like a pain in the ass to deal with.
>>31324348See above.