Hover over the icons under "Damage" to see list of attacks.
Dragon Lvl Weakness HP Damage 
Rattlesnake Dragon 25 
11,246 
4,697- Hard Charge: 3,518
- Leech: 4,112
- Poison Ivy: 4,112
- Ghost Cloud: 4,697
Gummy Dragon 26
14,159 5,542- Stunning Hit: 4,472
- Laser Beam: 4,957
- Poison Ivy: 4,957
- Electric Shock: 5,542
Platinum Dragon 27
12,380 5,055- Hard Charge: 3,876
- Magneto: 4,470
- Judo Kick: 4,150
- Snow Storm: 5,055
Reward: 2 
and 22500 
Strategy: For Rattlesnake use a Tropical , for Gummy use a Alpine and for Platinum use a Neon.
Your dragons should all be at least at level 15.