In this Colosseum, you may only enter with Pokémon from the Rental set. However, when you defeat a person, you are capable of exchanging Pokémon with the trainer you defeated just like in the Battle Factory

Colosseum Leader

Joe

In this Colosseum, you are in a Knockout Battle. You need to defeat each of your opponents or you will lose completely

Colosseum Leader

Taylor

In this Colosseum, your Team Order is decided by your Opponent, this required the most strategy as you do not know who's coming out next

Colosseum Leader

Marina

In this Colosseum, your Team Order is decided Randomly via a Roulette. It is unlocked by defeating the Waterfall Colosseum.

Colosseum Leader

Rosie

In this Colosseum, the battles are done in a 16 Person Tournement style. It is unlocked by defeating the Waterfall Colosseum

Colosseum Leader

Voldon

In this Colosseum, you are in a Knockout Battle. You need to defeat each of your opponents or you will lose completely. It is unlocked by defeating the Neon Colosseum.
Round Two turns this Colosseum into a Baby Pokémon battling area

Colosseum Leader

Sashay

In this Colosseum, it is a 6 Trainer Tournement including the leader. You need to get through them all to win. It is unlocked by defeating the Sunny Park Colosseum.

Colosseum Leader

Terrell

In this Colosseum, 12 Pokémon are Randomly selected and you and your opponents are each given 2 Pokémon. You must go through with these Random Pokémon to win.

Colosseum Leader

Dusty

In this Colosseum, you are in a Knockout Battle. You need to defeat each of your opponents or you will lose completely. It is unlocked by defeating the Sunset Colosseum.
Round two has you battling through 100 trainers

Colosseum Leader

Kruger

In this Colosseum, your Team Order is decided by your Opponent, this required the most strategy as you do not know who's coming out next.
Round two has you battling 8 sets of 4 trainers, all with strong powerful Pokémon

Colosseum Leader

Mysterial