Stadium/Dark Cup/3

Reward:  2 and 17500

Strategy: Use Dark Fire against Petroleum, Coral against Neon and Pearl against Hedgehog.
 * If you are still capped at Level 15, it is not impossible to win, but it will be very hard and you are unlikely to get much further than this battle without getting to Level 20 cap.
 * If you have Level 15 Legendary Dragons they work great!
 * If you have Armadillo Dragons level 15 (2 bronze stars) with Ninja Stars and Asteroids, Neon and Hedgehog will be easily defeated. Asteroids for Neon, Ninja Stars for Hedgehog.