Quoted By:
No signature type, trainers have diverse teams of mons.
(Mega) Mawile
I'm thinking a final are type gym that's a large coliseum, having the player go though 10 rounds of trainers before reaching me. The gym would focus on everything the player has learned so far, such as Megas, Z-Moves and different types of battles (Double, Triple, Rotation, and Inverse)