Hi Munners,
At this point you can make your Pokemon perfect by using IV stones (which you can get by Rock Smashing in caves) and EV train them with the EV trainer in your secret base or certain Friend Safaris in my earlier post:
Friend Safari EV Training Spots
There is also a possiblity that Delta breeding will be implemented in the 1.2 update.
You shouldn’t expect Legendary breeding to be a thing that will come to Insurgence, as it has never been a part of the game, except for Manaphy who gives you Phione Eggs.