as mention in the title, how can i unlocked all different digimon in the digivice? did we have to fight digimon or we need to let our pet die then start a new one or how? i would love to complete this collection 

btw, can we raise multiple digimon at once because my digimon feeling lonely hmm... and i feel that the stress took long time to cooldown

The game is a tamagotchi like, to complete the digimon encyclopedia you need to have those digimon. Multiple digimon at the time is kind of difficult to implement with the current system, the phone mimics a digivice like you have your partner digimon, these mechanics are taken from the DW1 game. A digimon full lifespan is no more than a month tops. Then it transforms into a digimemory.

ohh i understand noww, okay thanks dev =)

Wait.. So once it's fully evolved. Thn how do you make thm into digimemory?