Hover over the icons under "Damage" to see list of attacks.
Dragon Lvl Weakness HP Damage 
Ice Cream Dragon 30 
12,718 
4,624- Flying Kick: 3,976
- Flooding: 4,624
- Hard Charge: 4,030
- Ice Spikes: 4,624
Mojito Dragon 33
15,907 6,208- Hard Charge: 5,029
- Poison Ivy: 5,623
- Stunning Hit: 5,139
- Snow Storm: 6,208
Snowflake Dragon 33
15,907 5,623- Hard Charge: 5,029
- Earthquake: 5,477
- Head Butt: 5,249
- Ice Spikes: 5,623
Reward: 2 
and 28000 
Strategy: For Ice Cream use a trained Soccer or Pirate Dragon, for both Mojito and Snowflake, Soccer and Cool Fire are the best options. Well trained legendary dragons or pure dragons will do the trick, too.
The minimum level of your dragons to achieve this tournament should be at least 15.