Board Thread:Dragon City Gameplay Questions & Answers/@comment-569055-20131113031036/@comment-24143352-20131113063749

In short, the training center is a place where you can train your dragons to use stronger skills than they are defaulted when born and leveled to level 15. For example in the picture on the right, it is the page on the Kryptonite dragon. The left column shows the basic attacks that it would start out with without training. Listed with it are the skills it learns at level 4, 7, and 15 along with each of their "damage". The column on the right shows the skills that are trainable for the kryptonite dragon along with the new attack damage.

The full description of the training center can be found in the link below along with details on every skill in the game, default and trainable.

http://dragoncity.wikia.com/wiki/Training_Center