Battle Sims (Japanese: バーチャルなバトル Virtual Battle) are a feature in Pokémon XD: Gale of Darkness.
Battle CDs, of which 50 can be located throughout Orre, are used to create simulated battles at Realgam Tower. The player is given a team of Pokémon to use in the battle. Generally, there are turn limits to the battles and the battles have a theme. The first time the player successfully completes a Battle CD, a prize is awarded.
Battle Sims are also found in Pokémon HQ Lab, hosted by the Battle Coach using the Battle Sim System. However, these are only beginner simulations.
The first battle in Pokémon XD, and the first time Michael is seen is in a Sim Battle, where Michael is using a Salamence, while the opposing Sim Trainer is using a Metagross.
Sim Trainers are only found in Battle Sims.