I loved the battles and defeated the Yin Yang so I now have one. It is the best reward ever! Still trying to heal all my poor little dragons that got beaten but hope will be ready for next turniment.
Yes the 99 Battles is for the Levithian Dragon Pearls. You then have to craft it.
Battle for the YY dragon happens at the same Arena, but there is a RED Banner (in front of the Arena). It is a 30 round of Battle.
JAKE....
...Release the Kraken!!