Board Thread:Breeding Questions/@comment-24526597-20140209182918/@comment-10090661-20140210014852

There is no specific formula for Mirror.

You can get any Legend the same way -- by Breeding with a result of Pure x Pure.

Out of your Breedings, your chance of getting a Legend is about 6%, and the Legend you end up with is chosen by the Breeding System randomly. You should get about 1-2 Mirrors in about 200 Breedings.

All you need is patience, and keep Breeding the same thing.

Good luck!