The Battle CDs (Japanese: バトルディスク Battle Disc) are items exclusive to Pokémon XD: Gale of Darkness. They are used to initiate Battle Sims at Realgam Tower.
The Battle CDs can be taken to Realgam Tower for Battle Sims, simulated battles against virtual Trainers called Sim Trainers. These battles vary from puzzles to battles with Legendary Pokémon.
The first time the player completes a Battle CD, they receive an item prize. Once the player has completed all 50 Battle CDs, they will also receive 15,000 Poké Coupons.