>>36202993Not entirely sure what you mean, but it seems to be exactly like GO's system where you can take up to 30 pokemon from the box and send it to Oak. Like GO, the box is with you the whole time and not in a Pokemon Center. Seems to hold up to 719? You can get health, mighty (atk), tough (def), smart (s. atk), courage (s. def), and quick (spd) candy. This probably is what you should do with extras from the same species, so getting a bunch of Pidgey early on would likely net you a lot of Quick candy.
The pic is from 42:34 of Nintendo's E3 footage on their channel.
https://youtu.be/Fzh99yoNOXI 