Board Thread:Dragon City Questions and Answers/@comment-94.220.2.143-20130521065653/@comment-3271569-20130521164509

The only trusted source is andibad that figure it out. All other guides are just copy pass. That guide even contains false information regarding the breeding boost. So I wouldn't recommand to use external guides even on the official social point forum.

Rating system only counts for generation I-V. It's currently unknown if the rating system has effect un exclusive dragons.

You can calculate the rating by counting the earning/min together. For example: Terra Dragon level 15 = gold/min.

If you count those two earnings together you will form the rating. Than you can calculate the slots. This maybe look an bit complex, but maybe this template can help: User/Breeding

Example: