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The game features 11 different colosseums (all of which are completely the same, except for the setting), each with special changes to normal play or prerequisites and a Colosseum Leader (Except the Lagoon Colloseum that is only used in DS Battle Mode and Online Battle Mode). Six out of the 10 Colosseum Leaders wear Pokémon costumes. The costumes are: Marina of the Waterfall Colosseum wears a Kyogre costume, Taylor of the Main Street Colosseum wears a Pachirisu suit, Rosie of the Neon Colosseum wears a Roserade suit, Terrel of the Magma Colosseum wears a Groudon suit, Dusty of the Sunset Colloseum wears a Lucario suit and Voldon of the Crystal Colloseum wears a Electivire suit. Also, the Crystal Colosseum can hold up to 16 players, the battles are done in a 16-person tournament mode. The Gateway Colosseum is only open to a rental pass holder. As the player progresses, the Pokémon available to rent become more powerful. The player also earns Poké-Coupons, which is the form of currency this game. The player can then further customize his/her character.
Pokémon attacks are also much more diverse, with each Pokémon acquiring their own animations for most moves in the game. Some animations feature both the attacking and defending Pokémon on screen at the same time. In previous titles, the game only showed one Pokémon attacking and then cutting away to the second getting hit by the attack.
Along with the connectivity to the Nintendo DS games, a player can win Pokémon from this game and transfer them back to their DS games through Mystery Gift. This feature allows players to obtain Pokémon that are either hard or impossible to get without using a cheat device. To unlock the Pokémon, players must achieve certain goals or enter a special code. So far, Electivire and Magmortar are the only Pokémon that can be obtained through the latter method. In addition to the Pokémon download, players can purchase items like certain Technical Machines and evolution items.
Players can create and customize trainers to use in battle. A trainer's apparel, accessories, hair color and, in non-Japanese versions, skin color can be changed.