As of now I don ' t think there is a way to know which unique skill a digimon will get . I spent 21 Gallantmon medal evolving a 4 Wargrowlmon only to get his AOE skill . It wasn ' t bad but i was hoping for single target skill . The ideal digimon for breeding is a digimon with good Leader Skill and have gold or silver medal on any stat . This is because Leader Skill cannot be gained or changed and having medal would boost his stat even more on a 4 . You can get your digimon to 4 anyway you want either by the same digimon or change evolution line . Using the same digimon over and over requires you to prepare 74 mega medals of that digimon , which is kinda hard because usually an advent event last for only a week . Changing evolution line only requires you to prepare 21 mega medals of the digimon you want for the last 4 but it might take some time due to waiting for the digimon to appear .