First create an icon on the menue that is a colosseum. Then this is where the fun begins! The concept is basically like the hunger games and instead of districts they are known as "servers".
In each server players can create a team/clan and it could be similar to pvp. Then the clans battle against the other clans from different servers. There are different rewards you can win and these could be determined by a system such as the leaves. But there should be a huge reward, which is a level 4 synth stone and this shall take a lot of effort to obtain. I just believe that there should be more than pvp within your server that your in and you should be able to get rewards that help you on your dragon journey instead of having a worthless medal that says nothing about how good you are because someone could have a bad medal but be better than another that has the crystal medal. Also it would bring more fun to the game because you and your friends would be able to play together against other people in different servers.
Also there should be a weekly event in the colleseum.
I really hope that haypi dragon takes my suggestion because it wouldn't be hard to do at all and it would create a lot of interest.
- -LVL 37 Lava
-LVL 28 Angelo
-LVL 24 Crystal
-LVL 17 Leshy
-LVL 15 Roco