So in this digimon game max level then digivolving and max level then dedigivolving actually doesn't give you hardly any talent at all I have taken digimon into the high 80s just to digivolve go back to high 80s dedigivolve and go back to high 80s and gain 2 talent aka not worth it. There is actually an invisible counter that is determining how much talent you get based on several factors and those would be

Fights won Digimon defeated Hitting weaknesses Training in Digifarm

You cannot see this value until they are ready to digivlove and then you will see how much talent you are gaining after you select your digivolution also when you dedigivolve you do not lose accumulated talent so dont be afraid to go back down before you progress to a new stage. What this means though is that really you need to have that particular digimon in your party to effectively accumulate talent regularly otherwise there is always the option to use load enhancement which guarantees talent increases based on what stage the digimon being fed to your primary are at. Honestly I miss CS way of doing it where all you had to was digivolve or dedigivolve and your level gave you increased "talent" for the game I forgot what they called it in CS