Hover over the icons under "Damage" to see list of attacks.
Dragon Lvl Weakness HP Damage 
Pure Metal Dragon 37 
25,652 
9,458
Stunning Hit: 8,170- Rust: 9,239
- Karate Brick Break: 8,444
- Cannon Balls: 9,458
Wizard Dragon 38
22,747 8,397- Stunning Hit: 7,327
- Meteor Shower: 7,812
- Head Butt: 7,437
- Ghost Cloud: 8,397
Crystal Dragon 38
26,521 9,540- Head Butt: 8,580
- Legendary Wind: 8,808
- Paralyzing Spell: 8,955
- Rainbow: 9,540
Reward: 2 
and 36500 
Strategy: Use Pure Dragon for Pure Metal with Hypnosis/Pure Energy. Use Cool Fire with Snow Storm to defeat Wizard. Finally use Wind with Aurora Borealis/Mirror with Rainbow attack to Crystal,or if you don't have Legend,Use Half-Terra Dragons.
Before the Light and War update, this was the last tournament.
You can see what have changed since the Light and War update here Stadium Update 06-08-13