How to upgrade the monsters in Dragon Wars 7 Monster Park?

After catching the monster, let the old man choose the first search slate, arrange the monsters in order, and the ones to be upgraded rank first.

After finding the slate, go to the immigrant village, install the slate on the underground pedestal, and get through once.

Then go to the NPC on the right side of the pub in the lower left corner to distribute letters. First, exchange slate, select what you just entered (you need to set the message for the first time, this is optional) and start the exchange. One can be upgraded to 1, and at most three can be changed at a time.

Note that only monsters with heads can be upgraded.