Board Thread:Dragon City Gameplay Questions & Answers/@comment-5099132-20131031210736/@comment-10090661-20131101035015

There are none at the moment. The higher the Level/Rank, the stronger it is.

However, if you are talking about fighting Pure Dragons / Hybrids, A high-ranked, Level 23, Cat 4-5 Dragon can defeat a Level 30 Pure / Pure Hybrid using trained attacks.

I should know. I do it regularly. :)