The best way to get a better chance at breeding a * Rank is to do so while in an area that has 'Risky Winds' condition. You can see whether a place has this or not on the forecast page.
I got this achievement by breeding a Pegaslick in a Risky Winds location, and used 15 Lofty Fancy and 20 Dulcet Fancy.
The below link shows the most efficient way to obtain * Ranks though - I couldn't understand it, but thought I'd include it just in case someone else can!
http://www.gamefaqs.com/boards/997779-kingdom-hearts-3d-drea...