In SA2: Battle, I played Chao Karate, and beat every tournament. In the expert level, there's a Chao with a bad attitude, and he's the last Chao to fight. His name is Wacky, and you fight him again in Super mode for the second battle. How do you make your Chao act and lose like Wacky?
You can't, really. However, depending on the chao's personality, it may throw temper tantrums similar to the way Wacky does while in the gardens.

~ Crazy C Lea