Board Thread:Questions and Answers/@comment-186.13.7.127-20140321163438/@comment-3241231-20140928193958

It's based on base (Level 1) stats, not anything else. There may be variations based on ties in base stats (there are a few in the 40-60 total stat range), but it should be more or less the same.

In your case, it goes Maalvus (20/15), Solara (17/19), Dolomar (19/15). The ordering is based on total (level 1) stats first, then highest attack to lowest attack.