The most important thing is Elemental weakness. When you attack the enemy, there will be 3 things that happen, ” Strong Attack” , “Weak Attack”, and “Normal Attack (doesn’t display anything)”.
what’s the difference??
The strong attack has higher chance to inflict critical hit on the enemy (which is needed to win the battle). WEAK AND NORMAL ATTACK CAN INFLICT CRITICAL HIT, BUT THE CHANCE IS LOWER THAN STRONG ATTACK.
 Then Rarity and Level. You will have a very hard time against ultra rare creature Lvl 18 – 20, if you don’t use Lvl 15 super rare creature against them.
So your priority have “Super Rare” Attacks on each element (6 elements). This can be achieved simply by 3 creatures, mines are
Onyx Ox (Dark-Fire)
You don’t need to follow that guideline, the most important thing is to avoid feeding “same” element twice (if you train Onyx Ox then try not to feed Vinotaur because there is fire element), because the super rare creatures need a lot of food.
The most important element in my opinion is dark, why?
From previous experience on stage 27 -30, you will fight Emerald Dragon and Crystal Unicorn. Both of them are Ultra rare and weak to Dark. However, if you don’t use Super Rare Dark (Lvl 15), you will have very hard time against them (example: you use lvl 15 skyger, even skyger is at level 15 it’s only common animals so the chance is pretty small)
The 2nd important element is Plant, why ?
Because Treasure toucan and Golden Retriever are weak against it. They also appear on the last level of the battle tournament. This make Aurora Pegasus is very good animal (it has dark and plant element , it’s also a super rare animal).
Basically, it’s same as the battleground, but the battle tournament has a timer (6 days or 2 days) and you need to pay 2500 Coins to enter the battle.
You can only enter the tournament once per hour (you can pay 4 gems to speed up the timer, but 4 gems are really expensive). I suggest you not to pay the timer using gems (unless the deadline is near). I believe you can clear this dungeon without spending any gems because the time frame is really long (I assume you enter the tournament at least 12 times per day, that’s same as 72 tries).
The battle tournament has 12 levels(2 days), 18 levels(3 days), and 30(6 days). The battle principle is same as battleground (the deciding factor is the critical hit). Visit THIS PAGE for more info.
77 th battle tournament: 25 December 2016 – 3 January 2017: Snowflake Drake (END)
78 th battle tournament: 10 January 2017 – 16 January 2017: Cave art Sabertooth (END)
79 th battle tournament: 17 – 22 January 2017: Diamondback (END)
80th battle tournament: 27 – 29 Janury 2017: Year of the Rooster (END)
81 th battle tournament: 3 – 7 February 2017: Napping Turtle (END)
82 th battle tournament 10 – 12 February 2017: Rumblebee (END)
83 th battle tournament 14 – 19 February 2017: Cuddle Monster (END)
83th battle tournament: 24- 26 February 2017: Hippiepotomus (END)
84th battle tournament: 17 – 23 March 2017: Aquamarine Pony (END)
85th battle tournament: 28 – 3 April 2017: Aries
For those who have advanced further than this table, visit THIS PAGE to see all animals weaknesses.
Thanks to Storm8 Forum(Eluzyion) for the info
Note: When fighting an animal with no weakness (usually an animal with single “special” element like melodeer, Matripony, etc), simply use your strongest animal that you posses (highest rarity and highest level), any animal can cause a critical hit to these special element animal, however it may take few more tries, simply be patient and don’t give up.
Upcoming battle tournament guide will be updated on this page so you may want to bookmark this page.