I would think of a triple gene animal that you like. Buy a female to breed your Pastel to that plays into the triple gene morph you want down the road.

Say you want a SugarFly (Sugar, Fire, Pastel)......

Start by getting either a Sugar or a Fire female. Then get the other morph female shortly after and start raising her up. After you hopefully make your double gene male morph, then have the other morph female ready to breed the following year to try and make your triple gene morph.